Shadowgrounds

Shadowgrounds is a top-down shooter for Windows, Linux and Mac OS X, developed by Frozenbyte. The game takes place on a space colony on Ganymede which is being attacked by aliens. It was released for Windows on November 17, 2005, in stores in Finland and Germany, and in 2006 in the rest of Europe and North America. As well as being available through retail stores, the game began being distributed on Valve's Steam on May 8, 2006.