Hi, I'm new! I've played for a while past days, and I would try to inspire you.
Have you ever played Spore? I loved that game, and I think the "terraforming" feature of planets could be intresting. I mean the "import fauna and flora to stabilize the planet's ecosystem" thingie.
You've set the game like a gold rush, and that's fine. But what if we have concequences on the ecosystem? What if we have tools that allow us to directly affect the ecosystem? What if certain equipment generate pollution or waste? Pretty much actual topic, I would say ;).
That's just a thought.
P.S.: Good job, even almost without any content the game is fun to play already! Keep it up, cheers!