The game could have greatly benefitted from a few more sounds; especially for those opening doors. The footstep sounds felt a bit out of place at first, but then I thought of the whole scene as a nightmarish world anyway; so that worked nicely for me.
I was genuinely creeped out the first time, I looked back and saw those creatures. You did a good job creating a vibe of uneasiness. The switch to a FPS shooter was great; like a dream where you suddenly regain control of your body and can defend yourself.