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[thatmexicanguy]

I'm looking for an old Dos game where you were on Mars. You would fly around in the atmosphere and you would shoot purple aliens. At some points, you could stop at these floating shops in the sky to buy stuff. Eventually, you had to build a bomb of somesort, go to the surface, and blow up a factory, which was your mission. The game was a side-scroller.

Ring any bells to anyone? I really need to know the name, or see a screenshot atleast!