Kerbal space program is on steam with a inf summer sale or so. I dont have experience with the steam version, i downloaded the new version with MEGA. Ive experienced the game with cool features robotic arms Going to the mun (NOT MOON) and crashing stuff Post a reply about your experience with ksp.
Using mods, I have made starships that can go to distant star systems and come back with barely a dent in the fuel. They have hundreds of seats and bring the FPS to 8 just by existing.