Something to add more challenge/reward in the later levels of the game, adding a hall monitor system and a Principal (or Dean).

• Hall monitors trigger once the shocked students surpass a certain threshold, say 50 - 75% of max allowed shocked students.
• Hall monitors have a wide vision range able to see all "lanes" of the hallway (from top to bottom of the screen) and can see behind them.
• When a hall monitor sees an abduction, instead of walking briskly, they actively run to the nearest (or furthest, if you want some chasing gameplay) side of the level, and report what they saw.
• If they successfully escape, the report adds a high number of shocked students, say 5-10. If you catch the hall monitor before they escape, they are corrupted, and the shocked counter goes down by the same 5-10 students, useful for when your activities are gaining to much heat and the cool down is taking too long.
• Hall monitors are identified by their sashes they wear across their uniform, and possibly a unique hairstyle such as a blonde ponytail

The Principal/Dean is a unique character that you may only see once per level and carries the same high risk, high reward concept.

• Similar looking physically to the teacher, although maybe with an increased bust size for visual representation of hierarchy, as well as wearing a black, business-casual dress suit.
• If the Principal witnesses an abduction, it's game over. 
• If the Principal is abducted and climaxes, the player is rewarded with a large Fap points bonus, and a 30 second immunity buff where the shocked counter does not increase, due to the head of the school being corrupted and incapacitated.
• There are no conditions to spawn the principal, purely a very low random number counter, similar to rainbow hair girl, but perhaps even lower.

And something I just came up with while typing out the previous suggestion: Work the occult club back into the game world more. 

• Maybe posters start showing up on walls and lockers in support of the club and the monster?
• Robbed girls start walking around school. They can't be abducted but act as visual shields for other girls in their "lane" in the hallway, providing you cover.

And of course, I also agree with many of the previous posts adding variations, fetishes, special girls, animations, etc., simply "moar content" is always better.
Perhaps toggle options for those various additions if some people don't like certain things, and fair enough, different strokes right?
There's tons of ideas that could be added, and some of them are more development intensive than others, but I hope you take into account all the suggestions throughout the development!

Being able to upgrade or switch your lockers. Spending Coins to lower Doubt. I love the idea of double action in one cabinet.
Maybe some super curious girl opening a humping locker and  getting dragged into. Or the lewd girl joining the action.

grabbing the exact same girl 3 (5?) times in a row leading to a bonus, like turning her lewd and have her more often around in lewd mode for the rest of the run.

With more lewd girls around, chances for spontanous girl on girl action in the hallway (the other girls may be shocked and flee, but won't raise doubt since there is no direct connection to the lockers)

Glasses, futanari/traps, sport dress, swimming suit

maybe an antagonist (school morale commitee girl?) which will attack a locker when she witnesses you grabbing a girl. Releasing the captured girl and damaging the locker, leading to reset of the locker (maybe after 3 times). Needs some strategy to conquer (maybe throw multiple lewd girls at her)

One question: what exactly is the function of the 10pt locker upgrade?

I've got kind of a lot to throw at the wall here, so sorry in advance!

-Shiolp's constant dialogue kind of dampens the sexy mystery and scariness for me, I'd like a button in the menu that lets me flip off his text box.

-Once your hallway is maxed out with perma-lockers and gas-lockers, the default tentacle lockers kind of feel like a bummer. They're much more risky then the perma-lockers and the reward feels too modest in the endgame. So, what if you could spend levelup points to upgrade the base tentacle lockers to turn them in to more rewarding "tier 2" lockers that are really worth the risk?

Locker Ideas:

-Aphrodisiac Locker: After this locker gets lust out of a girl and lets her go, it releases a cloud of aphrodisiac to anyone around. Instead of turning to report you, nearby girls instead turn in to those "heart" variants that won't report you and give additional points if grabbed by other lockers.

-Mind Control Locker: Once this locker is done with a girl, it puts a tentacle in her brain! The girl who comes out can spread lies for you to reduce the "report level", or perhaps lure other girls in front of a tentacle locker so that you can wait for the perfect solitary moment to grab them.

-Cowprint Locker: These don't just get lust from a person, they also get milk! I have no idea what you'd actually spend the milk on, though... maybe it's a currency that unlocks new outfits for girls that show up, or unlocks new girls for the hallway altogether? Maybe between days you can use the milk to bribe the administration/student council for benefits? Anything's possible.

Anyway, was so excited to see and buy this game. Looking forward to wherever it goes!

Okay, I got a few ideas for this that I think you might get some use out of, at least hopefully. Firstly, critiques:

I felt like the game was very base level at the moment, and relied a lot on the randomness of the girls spawning to determine what got report and what did not. The thing that got me the most reports is being unable to determine who the freshly pampered victim would come out in front of.  I'm cool with that being a mechanic, but there should be some way to mitigate it with counters that you can buy or some sort of upgrade.

There's no real game loop here, at least for long term play. No real sense of reward or progression as the game moves forward. You get more lockers, sure, but that doesn't unlock new abilities or story, or things like that. Once you get about 10 minutes into the game, you've pretty much experienced it all.

The animations aren't the best. They seem very flat and non-articulated, not much to really get into honestly.

You have some great ideas about the upgrades you *can* buy for the lockers, but without any type of description, it's hard to figure out what the icons mean when you buy them, and without any way to remove them or move them, it's a little frustrating to have to start over from scratch to redo the action.

It's been said before a few times, but the repetitive moans make it hard to watch the scenes themselves, which really makes the FAP zone not worth the effort to unlock things, which is one of the big reasons for the collection of hearts.

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Now that the critique is out of the way, lemme suggest some stuff for you that might help mitigate or resolve some of these issues.

You got a great start to a full story. I actually kind of got invested in this, only to find out that there wasn't much follow up. Having Shiolp attempt to understand what is going on around him, and then start to attempt to bring about some "Pleasure-pocalypse" would be fantastic to play through. Reuniting with the Eldritch Club and recruiting them to your cause of uniting all humanity in one large orgy until the heat death of the universe could be a great place to start, with the club members teaching you about the basics. Then, as you get through a few days, you can start to introduce new mechanics, under the guise of new victims, Shiolp getting stronger with more lust, and even the reveal of NEETs who are seeking them out. Maybe even a Yandere who finds out that her 'love' has been attacked and is now on the prowl for your lockers... Tension makes for good gameplay.

Having some parallel resource gathering would be a neat mechanic. Have something like Lust for Skill points and Knowledge for Upgrades. If a student has hearts around them, you get more skill for capturing them, and if they have something like books, they give more knowledge.

Skills can unlock abilities (Either cooldown oriented or once a day), as well as passive buffs (Like reducing noise from locker sex). Upgrades can make the lockers stronger and more efficient. You have to unlock types of lockers/tentacles as you go, in order, so something like an upgrade tree would work.

Heat should be used instead of reporting, showing that people are more and more suspicious of the hallway you are in. Heat can be in Tiers too, like Level 1, nothing is wrong. Level 2, Teachers and Moral officers are more frequent, giving bigger risk of detection. Level 3, everyone is spooked and more easily shocked. Level 4, Everyone is on High alert and you need to calm your tits. Once it gets to the top of 4, game over.

Mitigation of the dangers would be a fantastic addition to the game and make it much more strategy minded. Noises can alert more 'attentive' victims, so having an ability that could essentially pause a locker to prevent them from hearing would be great, but it's on a cooldown. Being able to drop an calming gas in the hallway to make everyone forget they are running from something would be a good way to prevent snowballing Heat. Being able to cause a distraction to make everyone look one direction so you can snag someone. Aphrodisiac darts so that you can cause one victim to go to the nearest locker without making Heat. Things like this to deepen the strategy would really be a benefit to the game.

You can have stages too, different hallways to show off different areas of the school, or even entirely different locations. Or, alternatively (or additionally), each location has a special unlockable area that once you get enough lust build up, you can infect it for a cool new unique set of animations for it. Could be a bathroom for the main hall, the storage closet for a gym hallway, an underwater hidden public shot for an Onsen, etc. This could also be a great way to introduce bosses as a way to progress the story. You're reaching the limits of the lockers you have, oh hey, there's a Delinquient, she's a badass that goes to visit the back alleys during school hours. If I convert her and give her my Boon (Or seed or larva or whatever), she can put me in this new place to spread the good word of Pleasure-Pocalypse.

There's great opportunity for more varied victims, each with a unique benefit and mechanic. For example:
- Teachers: Can see totally around them, and a report from them gets more Heat. They can calm fleeing students if fucked well enough, or unlocked through passive skills.
- Librarians: Give A LOT of knowledge, but they are very sensitive to noise. Can reduce Heat if fucked well enough or unlocked.
- Delinquents: Boss style characters that roam the school. If they get alerted, instead of running and reporting, they dent the locker with a weapon of some kind, preventing you from using it for the day. They can distract Authority figures by flashing them or flirting with them if fucked or unlocked.
- NEETs: Give you a TON of hearts, but if they are alerted, they attempt to open the locker and get inside, making a racket and attracting attention. Maybe some kind of quicktime event to knock them off until you can get an upgrade to take them as a pair.
- Selfie Takers/E-Girls: Have some kind of camera pointing behind them, giving them the ability to see more. They can open lockers to record sex for more Lust.
- Moral Officers: Harsh Reporting penalty if they see something, but can prevent students from showing signs of being fucked upon exiting.

You could even have a system where each of these are a 'boss' and by defeating them and making them submit to you, they are unlocked as a background character to give you passive buffs for the stage at some kind of cost like, less lust per student or more noise generated in the lockers.

I'd be happy to give more feedback if you would like to talk more about it :> I've been a smut writer for nearly 16 years now and I'd love to get more into the lore of the game with you!