At the end of my first game, I survey my halls.

Housing and entertainment on the surface, then mining tunnels, then my glorious throne room, then the deeper mines, and finally my treasure vaults far below the world...

... and I think that this is a kingdom that a Dwarven King can be proud of.

Great game! There's a good sense of progression as my dwarves get better equipment and delve deeper, and different buildings become useful.