Although I know this is already a finished game.
Even though I know this is a game that is already done with and in stores, I'll review it.
Story: A great opening, with some vague plot behind it. I'd play the full game just to get the plot, if that were an option to me at the moment.
Gameplay: The game takes some classic Zelda elements, combined with momentum and some shooting mechanics I haven't seen in a while. It throws in the game with almost no information, but makes up for it with easy to see game elements that would easier to put in words. The Binding of Isaac mixes some RPG/Shooter elements, and does it flawlessly. 10/10
Music: Takes some simple instruments, and bends it to that of a child's tune, emphasizing the other elements that make a game. It helps to add the disturbing feeling to the game, and gets the feeling across very well. 10/10
Note: I didn't review the art, because thats not what makes a game.