Good start, now finish it!
You have a basic setup for a great game, and this is a perfect stepping stone for a resubmission of an awesome game. I really liked this game for many reasons. First off, it was fun and simple. Secondly, it was easy to control, which a lot of games coming through are not. However, one level and one opponent and hard to hit walls make the game a little small. I would spruce this game up a whole lot, resubmit with 10 levels or so, and go all out with it. This is a good place to start, so keep at it. Good for what it was.
--jmtb02