It would be great if some ressources can be mine from the lands, for example :
-Ore
-Gold
-Titanium
-Silicium
Each plot of land would be randomly assigned one ressource only that we could mine and later improve efficiency of the mining.
Those resources could then be required to build some buildings, craft robots/weapons/hero equipment,…
We martians would have to collaborate and buy and sell different resources depending on what we produce/what we need to progress