Move city changes
I suggest two things that should be changed:
1.It should take time to move your city. This is just logical. Its crazy to be able to move your city in an instant. This time should be based on how far away that point is, for longer distances it should be a long time.
2.A Certain time between move cities. Probably only a few hours. This gives the opponent a chance to fight back, which they should always have.