Oops, I might wait till my friend comes round tomorrow so I can play it against a human opponent! Immediate impressions of your art are good though!
Hey, just gave the AI build a go!
Your game reminds me of dodgeball, which was fun!
Two mechanics I really liked were the way the centre-line pushes toward the losing player (stopping games from dragging on too long, while still allowing for hype comebacks: great example of a positive feedback loop) and the way you can position yourself in such a way that your opponent has to choose between attacking you and gaining a powerup.
Really fun little game, I'm keen to play it with a human!
It reminds me of the same keyboard games I used to play with my little brother when we were kids.