Oh no! Those pesky aliens are invading the planet - again.
Prevent them from polluting the environment by blowing them all to kingdom come!
Vertical thrust: SPACE         Fire: CTRL (or ALT for OSX users)         Move: arrow keys
Tips for Playing
Don't get too high!
Keep your distance.
Return to base to replenish your shields.
Clear the map as fast as possible as your score decreases as the pollution grows.