Very interesting submission and I like the idea of using the deck of cards for actions and items. I absolutely love the theme and would jump at the chance to play this game!
I worry that as an RPG you expect too much prior knowledge from players - that they understand certain concepts and ideas. A good example of this is on the monster stats - they all have a Heart value, but I have no idea what that means! Having said that, I'm not much of an RPG player, so I'm not sure if I'm the target market for this game.