Galactic Hitman Steam Gift

Galactic Hitman is a sci-fi first-person shooter. You play as a hitman who has been tasked with clearing out the Dargenziz pirates who have invaded a series of six colonial space stations. To complete each level you have kill all the alien invaders. You start of with a weak laser pistol but can pick up one of the aliens laser rifles in the first level. Both of these weapons have two methods of firing, one which consumes your ammo, and one that does not.

Your health can be healed at regeneration stations at certain points throughout each level. Once the final level is completed you are congratulated for defeating the alien invaders.