I was reminded of this game by the StarFlight episode, as the games share *some* of the same dynamics.
Basically you start with an empty asteroid floating through space and have to build a base. Once your base is bootstrapped, you can start to build defenses and send spy ships to scout prospect the surrounding area for other asteroids which might contain valuable materials which you could mine. Of course, there are other colonies doing exactly the same, who don’t appreciate competition…
It’s a superb open-ended game, which you can easily accidentally sink hours into.
Admittedly, I’ve played the Amiga predecessor (K240) more than the DOS version, but it’s very much the same game.