In Unstoppable Gorg, you can move your towers by rotating the orbits that surround planets and space stations (1:28)
Futuremark Games Studio today released a new gameplay movie from Unstoppable Gorg, a tower defense game coming soon to PC, XBLA and iPad. In Unstoppable Gorg you defend our solar system from the relentless march of a fearsome alien race by sending satellites into orbit around planets, moons and space stations. Unlike other tower defense style games, in Unstoppable Gorg you can move your satellites even after you have placed them. When the Gorg armada attacks you can move your satellites around their orbits to best defend against each wave, a convention defying mechanic that brings new vitality and interaction to the tower defense genre.