Pretty cool. Took me a minute to figure out what I was supposed to be doing. Showing the controls, even just in the description, would be nice.
Additionally, in-game, there's two important pieces of information. Your health, and the enemy's health. But these are the smallest and most plain looking things on the screen. Meanwhile there's meaningless symbols dancing around the screen. It'd be good to draw the eye to the important information, not the nonsense.
But well done getting something complete and submitted in 3 hours.