FREE: Battle For The Sun [Steam Key]

The listing, Battle For The Sun [Steam Key] has ended.

Battle for the Sun is an action-packed, first-person shooter documenting the realities of war seen through the eyes of a special forces soldier in a world under alien attack. We find ourselves abruptly thrown into an adventure as a talented soldier carrying out his duty in this epic war.
STORY
4 years ago, army alien experiments conducted by the National Army Space Research (NASR) in Area 52 provoked an unexpected disaster. An alien, captured by NASR soldiers for experimentation and research, found a way to escape and plead for help from its home planet. Alien attacks that first began as revenge over time morphed into a systematic occupation that became a threat to human life. Our hero, Dylan; in order to save his family, country, and planet decides to take part in this war. His superior skills were not unnoticed by General Briggs so, after grueling training, Dylan joins the special forces. He goes on to become one of the most important men carrying out strategic missions. While enmeshed in the horror of war Dylan's camaraderie, loyalty and virtue will be tested.

More info: http://store.steampowered.com/app/385700/
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This game works on mac and linux too!

Good Luck!