This top down casual strategy game seems pretty crude at first. And it is. There isn't much to it. The UI and unit control is clunky and difficult to work with. It's a bit buggy and it's not much to look at. However... it's pretty addictive.
The poor UI seems to be part of the difficulty of the game. When you are trying to cope with a river of Lava consuming your tunnel network, two Giant Spider Queens infesting your mine with hundreds of spiders, a flood, and all the while trying to mine gold to fund your efforts, things get pretty frantic and desperate.
You may find it very annoying in fact, as often the game will give you virtually no time to react. There is a slow time ability on a long cooldown, but even with this often it is impossible to stop a lava flow in time for example.
You have no direct control over the dwarves. Instead you can choose to spend money to force them to walk and dig in a particular direction. This makes every decision difficult if you are trying to conserve money, which you will need for military units, and for blocking off fatal sections of the mine, or forcing your miners to commit suicide to block off a tunnel.
The gameplay kind of reminds me of Dungeon Keeper (i'm sure there are better examples though) and makes me wonder if this game doesn't have a better approach to unit control. After all, you wouldn't expect to be able to rapidly redeploy your forces and execute manoeuvres underground.
There are a few random mini games thrown in, a few different play modes, even a tower defence for some reason. But the main game is where it's at. Try it on Normal mode for an hour and see if you can last that long! Definitely worth a look if you are interested in strat or managment games.