One of the most atmospheric dungeon-based games I played, the graphic style, the mood, the neat sound effects all add nicely.
You can, for example, zoom the 3d-view out until you get a top-down map like view with different symbols for your rooms, if you hover the mouse over these room symbols a new window suddenly appears and shows whats going on in these rooms.
In good old rpg- style you can upgrade and level your units, grow your avatar with things like bigger wings, stronger claws and later branch out into the mage, commander or warrior path with different visualizations.
And one more point to add: the developers are very active in communicating with their player base and listening at their wishes in the forums!
To sum it up - a fantastic game.