I am thinking of bringing in a few aspects of Warhammer 40k that I find interesting. Some races, some gear, some planet ideas, Chaos, but not making everything quite as warlike, throwing in intrigue, exploration and some of that old Star Wars feel of an oppressive regime and dozens of factions oppressing it, most of these having that "slightly used" gear feel.
Imagine a universe where Chaos is rising and the forces of Law have been broken and struggle to fight the tides of entropy while neutral forces struggle against Chaos to uphold the Balance (and for their own interests).
I suspect highly that you're essentially reverse engineering the house traveller game of Games Workshop circa 1984...