Last Ninja was also nice on C64.
Can't remember the name of the game anymore, but I think it required 3 disks and you commander of a team of people. And you commanded a space vessel, you could board other vessels in space, battle in space, travel through solar systems, excavate planets for stuff to buy and sell, enter the planet's cities and houses, trade with the locals etc. Quite extensive, especially for that day and age.
Ah well, enough miles on the the memory lane...soon I'll hit level 60 at Skyrim.