Let's start with the pros:
Love the concept. I love that each side has its damage, and that also when you get powerups, they are added to that side.
But it doesn't add up to a great game. Movement is jittery in part cause you can't hold down a key, there is no goal at all, not even a high score to beat, to the point I could just go back and forth doing 5 and 6 damage, but only until I got bored because nothing had a point. The game has a poor title screen, but the ing same graphics are fine, though there is no music. Neat concept, but didn't turn out as well as it could.