To begin with, your colony needs a purpose. Your sponsor needs a reason to invest the colossal sums required to carry out such a project and your settlers need an incentive to take the risk of settling in such a remote and hostile place.
This! This quote right here. Every sponsor shouldn't have "goal" they should have agenda. What do they want out of this red planet?
For example, China and India. Their terrestrial holding can no longer accommodate all the population and it is causing friction in the country therefore necessitate going to mars and build colony to off-load these less unfortunate people, highly educated people... or just those unfortunate enough to get a lottery to the star. These resulting in more colonist but also create tension where if you cannot off-load these colonist in-waiting the government will start cutting support or cause diplomatic problem. You as a commander of this mission will either have to jeopardise the mission as to not incur thhe wrath of your colonial master or find someway else to fund your mission if they decide to abandon you.
Maybe Europe want to use Mar as a major research faculty, they want you to continue improving your research output weekly or else they'll start cutting the fund.
Or USA want to expand into Mar as another holding, they want you to keep expanding and exploiting Mars.
Or maybe Terraforming Inititive want you to terraform Mar fast, no matter the cost (They send you nuke to use on ice cap, else they use it on you instead.)
Sponsors need to be both incentivize to and penalize player to certain extend.
Next is about colonial stress and needs. Each sponsor would have different colonist background. Something like, Japanese is highly specialized, mechanized society. However, they're not space hardened, so Japanese colonist might receive specialize bonus but malus when work outside the dome. They have mechanized mining facilities but it is less efficient.
And also, to add change into each sponsors, a specialise tech tree. So maybe Japanese have a tech to allow them to mine precious metal with automatic, mechanized facility and then another one to remove their malus when working outside, maybe by increase efficiency for these mechanized mining facility to play into their "Playstyle".
All of these should be optional though, and also should be alternative way to play. Maybe when finish research sponsor tech it gives you event where you can choose how to play your style. Maybe I want to play Japan but I don't want to use mechanized mine so when I'm done researching for way to remove the malus, it gives me option to remove the malus to outside facility outright and not give me auto-mining effeciency.
Something like this, with high moddability, is going to be very nice.
- 2
- 1