You are strapped into a spaceship to take on five dangerous planets, with environments ranging from a pleasant green field, to a lava lake and a field of ice.
You will have to fly freely before cutting through tunnels and canyons, and finally destroying an alien base. Your energy starts at 1200 and decreases as shots hit you, or you make contact with a wall or blockage. You have infinite cannon fire and guided missiles to help you along. You can get regular energy recharges and power upgrades, by shooting and then collecting their carrier pods.