This is gonna be a long comment, mostly because for a FNIA game THIS recent to be THIS good and without stolen assets is honestly suuuuuper rare, so I want to give as much feedback as possible. Basically the tl;dr for those who don't want to read this is if you liked Fuzzboobs you're going to like this. It's basically Fuzzboobs FNAF 4, but without the annoyance of going deaf when you play FNAF 4. Has some issues but for a free game it's forgivable. Also if you want a guide on how to beat the harder nights (also 4/20 mode which I did beat) I'll put that at the end.
Ok so first let me go more into detail about what I liked. Firstly, this is probably the most creative FNIA-like game I've played in a while. All FNIA games either try to replicate FNAF, FNAF2, or forget the setting and go 3D/free roaming. These aren't bad options, but playing a FNIA game that plays like FNAF4 is refreshing.
The art is great and the character designs are fantastic. I do think the art has some room for improvement, but considering you are a solo dev it's pretty amazing that they look this good. The animations are probably the worst looking thing since it's mostly simple image warping, but the poses and facial expressions work to supplement where the animations lack. I'm not an artist so I can't say how you could improve, but know that for the purposes of this game, the art is fine.
The jumpscares and scenes are great, and basically repeat on what I said about the art. I will also note that the fact that these are original designs and animations is great. So many games either don't have animations after you game over or are stolen/paid for animations. Also the game is thrilling without being scary, which makes the game fun and approachable even if you don't like horror games.
Next, what could be improved upon. First would be the sound design. I like that you have music in a FNAF game, and because the sound effects are loud enough to tell what's going on without destroying your ears, the music doesn't intrude. What I don't like is the quality of the music itself. The songs are thematic and it feels like I am in a club, so I don't hate them. But some songs loop a ton while others just don't sound the best. You can always mute the music so this isn't a huge deal, but if you are going to improve one thing about the game's presentation, the audio would be what I would focus on. Also phone guy is WAY to quiet and I could never hear him, so I always skipped his scenes.
The other thing is the game feel. This is a new game so I'm sure you will work on it, but basically the game plays faster than the visuals. Not only does it make the game feel awkward, but it also allows for some cheese at times. The most harmful example of this is when you click on bonnie's door multiple times, the clickbox for bonnie's door activates before the animation of running over there completes. So if bonnie is in your doorway and you accidently clicked twice, you'll turn on the flashlight while the game shows you running to the door, and then you're dead. And to be clear, ALL clickboxes activate before the visuals show where you can click.
Finally there is difficulty. Without cheesing the fact that clickboxes activate immediately, the game is waaaaay too hard, even on night 4. Foxy moves super fast, and if you wait at the door to make sure you account for a delay in the laughs, Foxy will kill you. Basically if you played the game normally, 4/20 is probably impossible and night 4 is very very hard. I couldn't get past night four 2am without exploiting that clickboxes immediately appear.
So for those who want to know how to win, here's my 4/20 tutorial:
To remind you, freddy and foxy have 4 stages before they kill you. When you click on them after a while, they will typically be on stage 3 or 4, and when you flash the light or close the door, they will reset to stage 1. To do this most optimally, spam click the flashlight or door until you see them in their initial stage (foxy lying down, freddy slumped over).
First, don't try and keep foxy out. She'll get in, and it's better if she gets in as soon as possible so you can get her to her first stage and start the "cycle". She'll be the fastest one and will get in before bonny or chica get in, so basically keep freddy at her first stage until foxy gets in, then make sure foxy is at her first stage before starting the cycle.
What is the cycle? Well, if you've seen FNAF 4 gameplay, specifically the nightmare mode, it's similar to that. If you haven't, basically check the following characters in this order: Bonnie, Chica, Foxy, Freddy. And that's all you have to do. If you are quick enough and exploit cheese, you just have to do this the whole night and you'll win every time. Here is how you most optimally do this. I am assuming foxy is in, freddy and foxy have been recently set to their first stage, and you are sitting on the main screen (not at doors, foxy, or freddy but can click to get to any of them). This works regardless of where bonnie or chica are assuming you are doing the cycle as fast as possible.
Bonnie:
For Bonnie and chica, you need to move the camera slightly to get to the door clickbox, so you can't expoit the clickboxes for them. Move the camera left and as soon as your mouse is hovering over any part of the door (it should glow when this happens) click there. Immediately put your mouse in the top right corner (below where the pause button would be so you are clicking on the doorframe/wall) and spam click to close the door a lot. The door closing animation interrupts itself, so you will see the door close a lot. If bonnie is there, you may see a frame of her animation or you'll hear her laugh but see an empty door close. The game just checks for if you closed the door, not how long you hold it close, so if you spam the button you'll kick her out every time.
NEVER use the flashlight. It's completely unnecessary to do so, and I won specifically because I didn't use the flashlight. If you close the door when she is far, she'll just approach the door. If you click again, she'll then leave. This means you can get away with only 2 clicks, but I liked to spam the button a lot just in case. If you're paranoid like me, just spam closing the door maybe like 5 times before leaving.
Chica:
Since you should be leaving bonnie's door you'll need to wait to run back, then move the camera slightly to the right, then start spam clicking the top right to close the door a lot. To be fair you can spam click anywhere, so long as where you are clicking closes the door. This applies to bonnie as well. Remember don't use the flashlight; just spam click the door closed and be ready to be quick when you leave.
Foxy:
This is where you have to be quick. Immediately after clicking to leave chica's door, click on the center of the screen where foxy's door should be. Because the clickboxes all activate immediately, you'll be brought to foxy's door without having to wait for the runback animation. Spam click her door like I explained earlier, then get ready to be quick again.
Freddy:
When you leave Foxy's door, immediately click where the turn around button should be on the bottom left. Since all clickboxes are active immediately, you'll be brought to freddy immediately. Spam click freddy like I explained above and get ready to repeat the cycle again.
This may sound complicated, but it really isn't. Just remember that you don't have to wait for the visual animations to do stuff, and remember that you should only ever close doors and never use the flashlight (except freddy obvisouly). You don't even need to listen to complete the night since you don't need to decide whether you need to use the flashlight or doors. This cheese might get fixed in post 0.8 patches, but for now this is how you win.
And yeah that's it. With cheese the game because less about strategy and more about how fast you can do the cycle. No 1/9/8/7 or 6/9/6/9 easter egg, but may be added when fredbear is added. Some glitches, like the camera button never appeared until I went to a door at the beginning of a night, but I never used the camera in serious attempts so it's fine. Beating 4/20 mode brought me to the phone screen where nothing happened and then the game went white before crashing, but that only happened with the custom night. Great game, keep at it.