Like others have said, an ending would really help this game out.
With that out of the way, I think this game uses silence and small audio cues extremely effectively.
I also really enjoyed how subtle everything was including what I assume are dead people from the pictures on the walls which you see very briefly. It leaves some of the horrors up to your imagination making it much more tense and creepy.
Overall it was an enjoyable game, and i hope to play more of your games in the future!