For your consideration
It would be great if there was an appropriate animation/image displayed when you capture a monster girl, rather than it just fading to black like when you neutralize one. Obyiously you would need one for each equipment/method of capture, (yoke, horse etc).
Also, as building/road placement can be quite important it would be nice if it were possible to move a building rather than having to delete it and then rebuild again when you find you can not fit a road in later. [Maybe give it a nominal mana cost, increasing the further you move.]