wow, this game is really cool! you weren't kidding when you said you were integrating bugs into your mechanics, the wall clipping stuff was really fun! the puzzles were all pretty engaging and make use of the alert mechanic and the wall clipping really well in my opinion! though the movement was a bit slippery at times, but maybe that might be a frame dependent thing and the friction wasn't applying fast enough? i'd get around 20-30 frames on average with the WebGL build on my end, still playable though. there were also some cases where i'd die immediately when i try to objects push me (especially the ones that chase you), so not sure exactly what the conditions are for the objects to either push you or kill you.
but man the atmosphere in this game is really good! i really like the look of everything, with the furniture standing out with its bright yellows against the greyish environment, its nice! the dialogue was neat and foreboding, really makes you think about whats going on. then the ending! seeing the results of your action at the end + the ambience that goes along with it, really cool stuff i like that part a lot!
what a great game and im really impressed that you made this using your own game engine, great work!