What a creative concept, and so well-executed!
I did wind up getting a lot more ore than I needed. If you consider the buildings on the left, the demand for wood vs ore is not equal. There are two forges that each require 1 wood and 1 ore (equal) and then the fletcher that requires 2 wood to make a bow. Since there's no counterpart that requires pure ore, this means wood is in much higher demand, so sending ore and wood in equal quantities leads to a bunch of ore laying around on the ground, heheh.
But regardless, everything else about the game works great together! Awesome job!! :)