Interplanatary
Interplanetary is an artillery game in the same vein as Scorched Earth or Worms, but with a lot more depth. In this game, you shoot weapons from planets and have to take into account orbital paths and velocities to destroy the cities and weapons on the planets owned by your opponents, all the time building your infrastructure, researching new tech and more.
Concept
Build some cannons, shoot some planets, keep your cities safe as well. Lose all of your cities, and well, you lose.