Ambitious entry!
Firstly- I didn't finish the game. I liked it, especially the puzzles (and that they are generated each time!), but in the end I got tired by being caught by the monsters every minute or so. Don't get me wrong- the monsters were cool and imaginative (I liked how each of them had a gimmick), but they were a bit too intense. And I'm pretty sure one of them could get you through the walls :)
The sound was really good! Given that the monsters use the sound to announce themselves (and in one case to track you) that's a really good thing!
The graphics... hmmm... a bit of mixed feelings here. The models are pretty simplistic (lots of stuff is just a glowing box), but... I guess you make it work. With limited light and (again) cool monster design it sorta all works together. Truth be told, the game could use a bit more of graphical fidelity. I'd look for an artist willing to cooperate (and like, a human artist, GPT has no style :))
Atmosphere is proper spooky, and the jumpscares made me... jump :)
Over all- a good game that needs a bit of difficulty balancing, and some graphical polish. Keep it up!