You are in control of Apollo Orbit, a little spaceship that is out to prove a point! You must work through the different areas of outer space to collect all of the stars.
Double-click in one of the two text boxes at the bottom of the game area. Set the value to anywhere between -10 and 10. Hit 'Enter' or click 'Orbit' to send the spaceship in flight. Hit 'R' or click 'Reset' to reset the level and have another go. Collect all of the stars to pass a level, use swirls to reverse directions, and avoid skulls. There are some hints drawn into the levels for you.