Amazing! ...and creepy.
Not only that, but the art was nice and went quite well with the music, it all gave the game the creepy ambience you wanted to achieve. Also, kudos for the intro, verrrrry well made. The game mechanic was something i had seen before, but not this well executed! Seems like you guys used alot of masks and stuff here. The level design was good even if the lack of stuff to see (or color) was a bit annoying, even it was meant to be like that. The puzzles remind me of Braid or Portal, mainly because i get that OMG I TOTALLY SOLVED THIS IM SO SMART feeling i got with these games :)
Anyways, EXCELLENT job here :D