Nice little time-waster...
I found no problems with it. My highscore is 12. Beat that! ^^
Yeah, there are a few things. It's impossible to predict where the ball's going to bounce, and usually it just bounces everywhere. Also I seemed to score goals randomly, sometimes even when the ball didn't hit the back wall.
Needs improvement (maybe an enemy paddle bouncing it back at you), but a fun little game nevertheless.