I'm playing the early access beta of Imagine Earth, a planetary colonization management simulation by Serious Brothers.
The game currently features a campaign of three scenarios where you are given objectives in developing each new world. Three resources are required by the ever-expanding civilization (food, power, and goods), produced by buildings placed onto the terrain. Some terrain types are better for collecting specific resources, and placing certain of buildings next to each other may reduce production. You can also research new items and building upgrades, and must worry about sea level rising when greenhouse gas output becomes too large.