You are ruining your beautiful game by putting this dogshit tactics hell overworld on top of it.
PLEASE just do a STS map. I cannot imagine a scenario where this meta game becomes fun. It's just tedious nothing at worst, at best it's exploiting pacman-ghost AI.
Obviously I'm reacting this way partly because the overworld is unpolished (I can't click on tiles to move??? I have to use WASD... IN DIAGONAL ORIENTATION??), compared to the combat which is so polished and nice.
So it's good that you haven't polished it, because it means you can throw it away, which you should.
KISS: Just do a STS map where I click a node, choose 1/3, and go to the next fun combat encounter!