Kind of hard to play. For some reason my cursor stayed on screen the entire time and the game just tracked it based on where it was on the monitor. Not fun. Beautiful, though.
Update: Very beautiful, calming, and interesting. I love non-Euclidian spaces and this game is done very well. The secret doors aren't that difficult to find, and most of the places you enter aren't big, so don't worry too much about getting lost or not being able to figure out where to go. Just wander around and enjoy the visuals. Don't worry about not being able to come back to a place you like. You'll have an opportunity.