I quite liked the art style and the music, and after I got used to it, I liked the flow of the two different gameplay components. But the crystal system was poorly implemented. After playing for 200 seconds, I only had 10 crystals. To get to the first permanent upgrade would approach ten minutes. The game does not have that much playability, with four enemies and only two powerups (it seems that you count the heal as a powerup, which I wouldn't.) This meant that I'm unable to experience that part of the game you designed, which is a shame.
Also a small annoyance, when the Ying Yang hits you, you are sometimes hit again, extending the stun penalty unfairly, since at that point you can no longer dodge.