Nice game! I really like the tile merging mechanic, I think that is a great way of creating depth and progress without letting the map get to big and unwieldy. My only feedback is sometimes there are slightly long stretches of waiting, perhaps you could provide the player with something to do like pick up bonus points or something. I think the game is presented well, and sounds very good. I was never confused as to what i had to do. Great work, thank you for sharing your game.