Cosmic Crush Planet
Start off as no more than a comet floating through space. "Collide" with smaller planets and comets to increase your size. Avoid the gravity of bigger planets and avoid crashing into them as well. Once this happens, you'll have to start all over, which is a real pain. You can move up or down in the universe and pass through several different galaxies. Prepare to have your reflexes tested!
Use the ARROW keys to move.