Dwelvers is a crossover between Dungeon Keeper (you're an evil dungeon keeper who lives one word below the surface, and you're in charge of building a base and summoning monsters to defeat everyone above), The Settlers (advanced production chain with many resources), and Minecraft (multi-layered terrain where the deeper you go, the more unique resources you find).
In Dwelvers, you dig underground, build a production chain, train and feed creatures, fight enemies above and below ground, and lay siege to various castles - all to please and protect your master - the Dark Mother.
This game was mostly made by 1 person. Most of the negative reviews about this game were about this project being abandoned, and indeed the development was put on hold for a long time, then some work was done behind the curtain. Now this game is finished and fully playable, so I encourage you to give it a try :)