Wooooow! Very atmospheric! Defenitly reminds me of the art of Fez, and I would not be surprised if something simliar to this was in that game.
Yeah, it's cool indeed. Very smooth style - I like the square core under the water. Nice effect.
I didn't knew what was on the preview, but it's awesome.
I love how you composed your tiles into this piece.
I definitly will play a game like this!