Use the keyboard controls described below to maneuver your ship, surviving
between the Asteroids as long as possible. To do so, you should avoid the
Asteroids or destroy the Asteroids and Guard Towers with your Laser Cannon.
When you collide with an Asteroid, your shield goes down. Your shield also
goes down when you fly by a Guard Tower. Luckily your Laser Cannon and your
shield recharge over time.