Needs real physics
It wouldn't have been terribly hard to actually calculate the reflection angle for the asteroid off the paddle. You cheated by simply making it bounce off to the side based on it's distance from the center of your paddle. There's not enough of a game there to not let the user feel like they're really in control of the bounce. Fix that and it'd be rewarding. Without it, there's only about 15 seconds of "defend my bricks" fun until I'm bored.