the lighting looks very jittery for some reason
moving around is very floaty, and it looks like moving into a wall doesn't stop your momentum, so you have to first decelerate, then accelerate even if you were up against a wall, so you get sort of "stuck" whenever you run into a wall, which makes it feel especially unresponsive, and, while it does increase the challenge, it does so in a way that makes it feel worse to play, rather than actually being mechanically/cognitively challenging
i'm also not a fan of the level where an eye spawns right next to you, that barely gives you any time to react and is not a good way to add challenge to a level, it just makes it so you die an extra time before remembering to hold D when respawning
some levels are just about dying repeatedly while trying to figure out where the key is, that's not good puzzle game design - the player shouldn't have to figure out "what do i even do / where do i even go", but rather "how do i get there / do it?", like how to bait the eye to give you some space to go
that's not to say the game is bad though, i like the artstyle and i think having to manipulate the eye's ai like that is an interesting concept, but it could use some more polishing (and playtesting! very important)