In this installment, players will be fighting in a war between alien machines and the last remnants of humanity. (coed.com)
For the uninitiated, both these games put a twist to the age - old tower defense formula, where instead of you being on the side of the towers, you are now in control of a convoy making its way through a maze of alien machines. (droidgamers.com)
It's also a game that revolves around mechanised alien machines, a scientist sent to another world and a whole lot of shooting, but that's just a fast and loose summary of Axiom Verge's story, so here's a properly explanation. (miketendo64.com)