Dungeons 2

Dungeons 2 is a dungeon/cave simulator, a strategy RPG with a few interesting twists.
You play as a demonic lord of the underworld named the Ultimate Evil. You control your minions from a throne room...

From the homepage:
The Ultimate Evil has arrived and a new Dawn of Terror is upon us. Especially if you are a unicorn, he hates unicorns. Snots throughout the underworld, prepare to quiver in your boots as Dungeons 2 is running on for Windows PC, Mac and SteamOS.
Featuring a unique mixture of classic dungeon simulation and real-time strategy gameplay, Dungeons 2 challenges players to assume the role of The Dungeon Lord, craft a network of terrifying dungeons and use its resources to fuel a campaign against the forces of goodliness. Order your servant snots to do your bidding and fill your coffers with gold, amass an army of lurching minions and then head to the surface world of the humans to conquer The Overworld.