Shadowgrounds

Shadowgrounds is a shoot 'em up for Microsoft Windows, developed by Frozenbyte.

The game takes place on a space colony on Ganymede. Players take the role of Wesley Tyler, who begins as a mechanic tasked with the repair of various systems. After the arrival of the aliens, the player performs a variety of quests until meeting up with the captain, who tells the player to contact nearby planets and ships for help, then to escape. The player then rescues the captain of a downed rescue ship, and is then tasked with destroying the alien mothership. Upon reaching the center of the ship, the player is approached by aliens who inform the player of the dangers the energy source that the player has been utilizing throughout the game.

Source: Wikipedia, Shadowgrounds , available under the CC-BY-SA License.