Very nice game ! Liked the ambiance & the tension in the game.
Little feedback : Some of the critters position seemed a bit unfair (right behind doors or corners where you have no way to anticipate an attack) which is great for the ambiance since you never know when or where you'll get attacked, but in term of gameplay get a bit frustrating.
The first boss looked very blurry (i guess its a critter but scaled up) maybe redraw it at the right size ?
appart from that, very good job ! :)