When you start, it's an FPS.

When you get a grasp enough of the language and the locals, you have the option to switch to a turn-based tactical interface. You can switch back and forth freely.

Eventually, you might have a home in the town. You can play the game this way forever if you want.

OR

You can go further.

Set up a coup and install yourself as leader -- or make your own town, out in somewhere wild?

You unlock the Civ-style interface.