With all the recent craziness about Spacelegs , I think it's important to remember the pioneers Parkan: The Imperial Chronicles was released back in 1997. A year before Half-Life and years before X and Freelancer. Notable Gameplay features Get out of the pilot seat and walk around your spaceship at any given moment. On-foot combat Ship docking. Board any ship in space. Both friendly and hostile. Land on planetary outposts. The interiors seems to be procedurally generated upon the first visit but will maintain it's structure since then. Survival mechanics. Your character on-foot can be exposed to various dangerous environments (Radiation, Chemical contamination, Biological contamination and so on) Base Building. Capture and colonize the planets. Once you clear the outpost, you can build workers, shipyard, factory, mine and so on. However, you have to think long term as the outpost survivability depends not just on it's resources but on the environmental conditions the planet provides. Every planet has it's own temperature, atmosphere, resources and organics. For example, the more resources the planet has the faster the factory will produce the fuel.