Control the starship and avoid the asteroids as long as you can. Move the starship right by clicking the right part of the screen (or pressing the right key). Move the starship left by clicking the left part of the screen (or pressing the left key). Collect bonuses that appear from time to time to gain fuel and extra-lives.
Press ESC to return to the main menu. Press M to enable/disable sound. Press +/- to increase/decrease the sound volume.