Press space to spawn a ball. Click and drag in any direction, then let go to launch it! Be careful not to spawn too much, or else it can lag and slow down a lot. Changing the gravity... basically changes the gravity (how fast they fall).
I've had this idea for a while, but I wasn't sure when to try doing it. It was a bit of a challenge considering that the balls are clones and not actual sprites, but I figured it out. :) I actually did this in about an hour. People are welcome to use this in their projects as long as credit is given.