As human colonies circle the earth, alien invaders prepare to take over our home. You're the only one who can warn Earth and protect its people! To start, use the mouse to move your spaceship. Moving your mouse around the screen will move your spaceship. Your spaceship will move as fast as your mouse, but moving too fast can cause you to run into enemies! Your ship has a shield around it that is damaged when your run into enemy ships. Your shield will refuel when you are not taking damage. You can attack invaders by clicking to control a comet. Look for upgrades throughout the game!