Thanks for playing! Greed is a powerful motivator, even when there’s just fake dollars at stake!
For progression and world building, I was actually thinking of a kind of business sim. You’re a company that is contracted to remove space trash from low-orbit, and you have to balance earning money with buying upgrades for the rocket. There could be different rocket types that have a cost to launch, or the engine upgrades and refuels might cost money. Or you buy a “permit” that unlocks higher risk higher reward trash (explosive trash, biohazard, nuclear, etc). I think progression is the next step!