A fascinating concept! Control a bunch of minions to dig around (much like Dungeon Keeper 2) and get gold & resources, all while warding off wades of adventurers.
The game is hard and I believe it's a gameplay decision, though I do wish it had a proper tutorial. And possibly some way to check on all my units at once. My first few sessions were essentially me bumbling around pressing random buttons hoping it'd work (it didn't, for the record. I still have NO idea how goblin archers are supposed to shoot arrows. Is it automatic? Do I need a specific key? Hell if I know.)
I also wish there was an option to change the font to make it easier to read, though that's a detail.