I'm glad you like it!
- I'd love to use more canonical touhou enemies in my fangames, but there's not actually a lot to work with (there's like fairies, moon rabbits (which are basically fairies with bunny ears), evil yin-yang orbs, PC-98 ghosts and fuzzballs, and a bunch of geometric shapes and particle effects that don't have a lot of personality - that's it). I currently only use fairies though so there's room to add more... (onis are from japanese folklore so that counts, right?)
- (Also at least 4 more Touhou characters are in the story draft, just not introduced properly yet - Patchouli, Kokoro, Tsukasa and Eiki)
- IMO using an actual canonical character as an assassination target would be going too far so those'll all be OCs.
- There's at least one more direct touhou reference implant in the game already (just impossible to get legitimately right now since it unlocks for purchase after a stage that's not in the game yet), I'll try to work in some more notable ones. I'm a bit limited by effects having to be passive at the moment but there's probably some way around that. (Maybe some stuff like Sakuya's timestop being a novelty grenade, Reisen's trumpet gun etc instead of limiting to just implants could help?)
- Yeah, I noticed stealth is way too easy at the moment (stage 2 has basically every stationary enemy facing away from the doorways which excurberates this problem), more advanced enemies have a greater vision distance/angle but I probably should make executions, vent-breaking etc make audible sound... (also maybe enemies that turn around in random directions erratically so they will spot you if you stick around)
- Effects being so turned up it makes the game basically unplayable is mostly there to really make the first impression as impactful as possible, I can see them being grating... for the first few days of prototyping I was actually going for Cruelty Squad's "intentionally make the game as hard to enjoy as possible" vibe and tried to turn everything up to eleven, but it eventually rendered the game completely unplayable so I had to scale them back to a slightly more reasonable level. But yeah, the options are there for a reason (I got a lot of premature complaints about the old-TV effect in particular... all these people liking straight lines, smh...)