Earth is under attack, and you are humanity's only hope for survival. The only way you can defeat the Krill force is to explore the mysteries behind six planets. On each planet, you can discover new Krill weaponry and gadgets that you can use to equip your character and your spaceship. With 50 kinds of "gun data," you can combine weapon attributes (such as spread shot, heat seek, and explode) to create more powerful guns.