Really cool game, great idea, pretty fun.
But you can't just put the player in a game and not tell them how to play. I know you put it in the description but that doesn't help anyone that doesn't know to look there. Just a little tutorial would make the game a lot better. When you first play you see a monster and you lose a heart, I still have no idea what to do there.
Instructions is all this game really needs, maybe a little more balanced gameplay as well, but other than that very beautiful game, the art is amazing.