Star Tower

Star Tower is a tower-defense game in three dimensions. Play begins in 2D, but you may also navigate forward and backward, revealing the path to reach greater challenges. Features include nebula obstacles, game-wide upgrades, increasingly difficult bosses, and special one-use powers. If the universe gains too much mass it will implode. Thats a bad thing, right? But another universe is pushing their stars into ours! Your duty is to kick them back. Starting with a single star-killing spaceship, yo...