The hearts have a (very short) set pattern, and because of this, the person can hit every heart that comes in just two tries, thus making the game extremely easy, and also turns the game into a tedious affair. Also, what was the point of the "combo"? It was just decoration?

Repetition is your main flaw here. You could have made the game more varied and more challenging.

The music is okay, as it is appropriate. The sweethearts could be more than just copied and pasted faces, those make the game to be rather dull, graphically speaking.