It's pretty cool. Pretty hard too. It's a post-apocalyptic frozen wasteland, and you and a group of wandering survivors stumble upon agiant pit sheltered from the wind, with this big "generator" contraption, powered by coal, in the middle of it, built by someone in preparation for the major event that caused the global freeze. You get the generator running and it produces heat but uses coal. Thus, you need a supply of coal to run it and dont ever let the coal run out or it will get cold and your people will suffer. You also need food, warm housing, wood, steel, and steam cores to build certain buildings or perform certain upgrades. You build a society and send scouts out to look for more survivors. But your people need to be taken care of. You make laws, build what they need, do whatever you can to keep them hopeful and content. If not, theyll overthrow you. Everyone needs a job. You have regular workers, children, and engineers. Engineers do better work that the normie workers though so take care of them. You can rule your society with an iron fist, or take a more liberal, religious route if you want. Every decision made by you, the leader, affects your citizens' attitudes toward you and everyone's survival.