One of the best games I've played so far. Art is lovely, graphics are great, even the book is gorgeous. Mood is awesome. Sound is good and creepy yet childlike, though the open window noises got obscured at times due to camera placement.
Two things that really got me is a bug, where you go practically flying, and can't go through doorways anymore (please add gravity). And the fact that you couldn't really see the doorways.
Once I figured that out, I was able to create a mental map and finish the game pretty quickly.