Again, I think the game is mostly about survival. With 200 people, you're probably not going to spend so much time and resources to spread out over a second moon. Or mine an asteroid when there would be plenty of ore to support a colony of that size. (Or to support even several thousand)
Yes, the colony has the capability to build a spaceship. But the last time they only built it because they HAD to. It would take a lot of time and work to create a starship big and powerful enough to make mining asteroids worth while. And at that, it would not be instantaneous.
They have ION drive and Liquid/Solid Booster Tech Ion drives arent that fast and Liquid/Solids dont have the fuel capacity.
This is very true. It takes months and years for an ion drive to come up to full speed (though it is much more efficient than a chemical propellant). Chemical propellants are not efficient enough to push large amounts of material. You would need very large scale production facilities for this. Again, it would take a lot of manpower.
My suggestion earlier (about a "mining outpost" mission) was more of a campaign type game. And there is more behind my idea of a time dependent mission than should be posted in this thread.