Stonehearth reminds me of civilization but in a fantasy world. So like civilization it should have a tech tree that you use to research different technologies. For instance you could research masonry to be able to construct large cathedrals and fortresses.
You could then have breakthrough technologies that unlock whole new levels your civilization.
Basically you start off in the default medieval fantasy setting. The after building the university and getting researchers/ scholars/ scientists that you get by sending a villager to the university and having a reliable food supply to feed him/her. Then you can select from the tech tree what you want researching and the researcher will begin researching it.
Eventually your university researches steam power. This unlocks machines like the auto loom and the steam locomotive allowing you build railways to transport citizens and goods across the map. You enter the steam punk era. The technology available is based off steam punk. That means airships and steam tanks along with top hats and suits for citizens! The hostiles will also upgrade to become sky pirates and angry peasants that will try and topple your kingdom. These will introduce new bosses such as a massive zeppelin and a huge wagon- mounted hammer!
After getting through the steam punk era you’ll enter retro futuristic stage of your civilization. This is achieved through researching the internal combustion engine and the atom bomb allowing you to research 1950’s era tech. But instead of powerful computers you research the maglev; an upgrade to your railway that allows fast trains that levitate above a guide rail. And robots. This ends after researching space exploration and colonization of space. Giving you access to the lower celestial region via retro futuristic looking rockets and allows you to build retro futuristic space stations.
Your main foes are, like that of the 1950’s communist invaders armed with Chinese/ Soviet assault rifles along with endless waves of tanks and aircraft. Even a couple of ships and the infamous 50ft tall robot that fires lasers out of it’s eyes!