DarkStorm

Long ago, humanity was ambushed by a mysterious alien race. Many perished—while those who survived were forced to find refuge in the mountains. Many years have passed, and the survivors cannot continue their refuge in the mountains. They must return home...

Play as MARS (Machine of Absolute Retaliation and Safeguard), a robot programmed to exterminate the treacherous aliens who have taken over Razor City. As MARS, you must free Razor City from its domination in order to save  the survivors from their doom.