Once the game starts, guide the paddle-like thing onto where the ball where land and click so that when the ball lands it will hit the paddle while it is changing color. (I bet that didn't make sense, just try it!) By the way it gets insanely hard.
I made this for a game design competition before I read that it had to teach people about math or science. So I just uploaded it. It doesn't have too much great design either, I whipped it up in 10 minutes.