I’m probably alone in remembering this game but I loved Hardwar back in the day. It’s an Elite style trading game set on Titan. The player pilots a ‘moth’ ,a small flying craft, between craters.
It had an interesting story that played out as you explored with areas blocked out, due to events, and made accessible later on.

The developer closed doors but IIRC at least one member of the team released a patch that had been developed later on.

I played it pretty obsessively and it had a small passionate community but it wasn’t a hit.