Hey, remember that one game with all those snazzy guns and that Gordon Freeman guy? You know, Shoot Many Robots? Well, it's headed in a rather unexpected new direction. After beginning life as a (relatively cheap) purchasable product, it's now launching a fully standalone free-to-play PVP extension. Titled "Arena Kings," it comes with the most uncharacteristically no-frills description ever: "Arena Kings is a PvP shooter…