This is a really nice, and neet idea for a horror game. The footsteps were super polished (both visually and audio wise) which made for a better experience.
As for improvment:
-In the case of a game jam game, I don't spend enough time to relay the entire game to get a new ending (I did the "Reset with it" ending. Perhaps make a way for the player to get all ending, that doesn't involve having to replay the entire game.
-Don't get me wrong, I loved the art-style of this game. However, I felt that the flare efects and the sound "ripples" didn't fit in, as they weren't all too "pixely" like the rest of the game.
-Some of the gameplay is a bit repeating. Perhaps you should've experimented more with the vents, including a maze of such.
Otherwise well polished, and fun game.