The direction and atmosphere really pleased me. The sound contributes a lot and the interpretation of the theme is good, after all what is more spooky than the paranoia that the mind itself creates?!
As for the art, it's simple but works well, especially the mirror part which is cool. Some people may find that some side view sprites make it difficult to understand what the thing is, like the sofa and the TV. In games like this, like old Pokemon, they usually draw them from the front or back to make it easier.
As it was done in Unity, I think it would be cool to add it as playable in the browser, if you can. Anyway, great work.