Star Control II is a collection of different interrelated minigame mechanics. You have spacewar-style combat, planet exploration resource collection, interactive storytelling with the communications with other races, resource and time management, ship and fleet customization, and exploration of the universe.
But some planets could require a side-scrolling platformer, instead of the top-down lander. Or you could put together a jRPG-style party and explore a settlement on a planet. You could play a Scumm-style adventure game on an abandoned space station. In addition to spacewar, you could have a bullet hell shooter for traversing an asteroid field. You could do economy management and trading, purchasing self-sealing stem bolts on Cardassia Prime and trading them for seal furs on Caladan. You could level up your crew to make them better at piloting ships in your fleet or participating in away missions. And of course we need procedural generation for the sake of replayability.