Unfortunately, I can't get passed a score of 9, the balls don't interact with each other or the paddles, and I have no idea what I'm supposed to be doing :( I would love to give some more specific advice on what you can do to make this game more fun, which in general would be to add some of your personality and originality to it. This seems more like a test project for a specific mechanic, and unfortunately seems broken.
Maybe lay out what you want from a game, who is doing what, and why? And keep trying.