Shoot your way through 8 stages and make your way to the Mothership. At the end of each Stage there will be a boss. Every stage, except for stage 1, consists of three checkpoints.
AUTO-FIRE: Press the spacebar to enable or disable auto-fire.
SHOOTING: If auto-fire is disabled, click to shoot. If auto-fire is enabled, the ship will fire a short burst of fire every second.
MOVEMENT: Move the mouse to control the ship movement.
SHIELDS: The shields recharge slowly. However, the supply ship will deploy a Health Box ONCE per checkpoint if the shields get below a critical level.
WEAPON: The supply ship will drop a Weapon upgrade every so often. Destroy more enemies to signal the ship to deploy a Weapon Drop Box faster.