Weltraumsoldat3D is a retro first person shooter (2.5D like Wolfenstein3D) set in space. You can play the German space marine "Weltraumsoldat" who is on a mission to kill all evil aliens in an underground base. Apparently the aliens are conducting some sort of mad research. Anyways the game is still in development. So if you stumble upon some bugs feel free to send me an email.