Out in the big scary world of space there are some aliens. They've got their alien eye-things on [your planet] and really want to move there, displacing you and your people in the process. How does one deal with a situation like that? With guns, lots of guns. And shooting aliens with said guns. Fly through wave after wave of aliens, laser planets, wormholes and asteroids as you take down big bosses and just generally feel good about yourself for being so world-savey.
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