Way too simple. I honestly don't see how this has a 3.7 average. The physics are the only decent part about this game - everything else is half-assed. Bad graphics, no real objective, you didn't even bother with the Kongregate highscores system.
Great game, with a great idea behind it. For those having a lot of trouble with it, just keep one ball (I prefer the one controlled with the WASD keys) in a corner that doesn't get much action. This way, you can focus on the other ball without having to move the other one around too much.