Sae your galaxy by fighting off alien invaders! To move your spaceship around, use the direction keys on your keyboard. When you see enemies, you can shoot them by pushing the space bar. You can also click your mouse to shoot. To upgrade your weapons and defenses, you can push S for shields, A for ammo, and W for weapons. Upgrade weapons as they become available in order to kill enemies faster and stay protected longer. Steer around road blocks and obstacles. If you run into them, your spaceship will crash and you have to start over!