I have put maybe half an hour into the game.
The building part seems quite simple, mostly like Dungeon Keeper but with a bit of resource management bolted on. (Iron/Wood/Gold instead of just gold) The other parts I did not encounter.
What looked intriguing was: I saw only a few parts of the world, mainly what my creatures saw. Could open up some possibilities for exploration.
It is only 2D in the current Demo.