Horrid.
First off, the music is horribly out of place for this game type, and especially the graphics used. Secondly, you drew nothing, and things you did draw were horribly childish. Thirdly, you used a square for the impact detection area, rendering dodging the rocks quite literally impossible. Thirdly, this took for-fucking-ever to load, and is nothing but 3-4 buttons, a back and forth moving object, and a randomizer that spews objects in one direction. And god, the music was a horrible choice. Maybe if you had better taste in anything, I'd offer constructive criticism, but this just plainly fucking sucks.