I AMm.

After a terrible accident that occurred over 300 years ago, almost all life on the planet has come to an end. Humanity could not find a way to continue existing in their mortal forms, and thus have moved their minds to mobile machines called "AMms". Augmented Mortality Machines now roam the world, the only life left being small pests and serval mutated crustaceans. You have no end goal. Simply survive and live for as long as possible by killing other AMms or doing small jobs for parts. How long can you survive?