Very atmospheric and horrifying! I really loved exploring this labyrinth - it's easier to find your way and be orientated, as I would have thought in that structure. It took me a while to realize I can jump THAT high, though.
Still, amazing atmosphere, the masks and the eye-guy are fascinating. The spiky roll, wasn't :P Opening doors in your world is interesting anyway. Would love to have a full game of 666 Coins!