Use arrow keys to control where to move, tap g if you want your character to follow your mouse-pointer then tap s if you want to stop using mouse-pointer!!! You can tap s if you want to have music on, and tap m to mute!!!
The idea is to dodge the rockets that could crash into you and grab as many of the gems as possible, you can to get you home. If you get to score 4+ you will get taken back to earth.