You play as a robot called V1. You are the first of 2 V series prototype models. After the conclusion of Humanity's Great War (replaces WW1/WW2), V1 ventures to hell to find blood so it can fuel itself. V1 can't kill people on the surface world because everything is dead. Why? Machines, of course. It started off slow. The Gutterman. Heavy TF2, basically. Then, the Guttertank, the machine to counter the last machine. That repeats until we get to the Earthmovers. A Magnum Opus of humanity's construction.
yes i wrote allat as the title, barely the tip of the iceberg.