This isn’t quite a game (yet), but an open-source generator for pulp sci-fi settings inspired by How to Host a Dungeon and the Dwarf Fortress world generator. You can view an animated description of the setting’s evolution, pause at any time, and export a detailed description of the world as a text file. To try it out, launch the program and keep hitting space to advance, or press R to enter auto-advance mode and come back later. You can move around with the arrow keys and see information about planets by putting the cursor over them.
http://www.zarkonnen.com/images/images/154.jpg
Download (450 kB jar file).
GitHub Page (source!)