Control your colorful spaceship and shoot as many hostile spaceships as you can within given time. You can't hit spaceships that have the same color as you: in that case change color to destroy those spaceships as well. Be careful, they fire at you, too! When you've completed a level, you can choose two options: upgrading your spaceship or extra time.
Your spaceship follows the mouse cursor. Press the spacebar to change color.