I don't know what to call this game really. It's just a little something I made out off boredom. I have one known bug though, but I don't know how to fix it properly. The bug is that the ball can get stuck to the paddle sometimes if you hit the ball from the side of the paddle.
https://gist.github.com/SebastianJarsve/5297676
Edit:
I think I solved the bug by setting the ball's y-position to the paddle's top() when they collide, thus stopping the ball from getting stuck inside the paddle.
Edit2:
Added a new "collide with paddle" function in the Ball-class. This function lets you control the ball's x-velocity depending on where it hits on the paddle.