Scrap was entry for 7DRL challenge in 2005 but after deadline author wished to polish it in order to make it more a game than a proof of concept. Later extended version came and finally 1.1 which fixed all known bugs.
You control a robot surrounded by other hostile robots. That is all you get to know about the plot but it is sufficient. Your machine can have up to eight systems plugged in. Any combination with at least one power source is valid. How one collects parts to plug into one’s robot? From other robots of course!