If you're a single player click 1 then the green flag, if you're playing with a partner just click the green flag. The red spaceship is the arrows and the blue is WASD. The goal is to hit the earth with touching as little planets as possible, if you're playing with two players the person with the lower number in the upper left corner wins, if you're just one player just keep trying to improve your score. To replay click the red stop button then the space bar.
Can you beat @RavenclawKeeper's highscore of 1?