ProtoGalaxy is a cross-genre video game for Microsoft Windows that was released on October 6, 2010. In the game's back-story, a species of powerful, unknown extraterrestrials enters the Milky Way with the intention of enslaving its inhabitants. The player characters must defend Earth from this alien threat and restore human civilization. ProtoGalaxy is a 2.5D game; the 2D playing field employs 3D graphics. ProtoGalaxy incorporates elements of a variety of gaming genres, such as adventure, arcade, shooter, puzzle, and role-playing genres.