Pretty good as far as demos are concerned. The horror elements are there, the game makes you feel uneasy at times and confused as hell at others but that seems to be a part of its charm.
I just so happened to break the game at the end I think, I'm assuming that the movable piece is supposed to break the other and reveal the final door for the demo. That didn't quite happen for me...
Apart from that, I enjoyed the small amount of time I had with the demo. I recorded a short let's play of it if you don't mind.
Cheers and best of luck with the development of the game!