Can rebuild it using X, as the game has no saves yet)
So, this is a quick 9-thread furnace hub with 2 tiny seller/collector hubs. Just imagine it being 27 furnaces and 9+9 sellers+collectors. (Also, sellers and collectors are kinda slow, so this setup will not work particularly well. Especially if furnaces will later be upgraded. Perhaps, sellers and collectors should not be taking so many ticks to reactivate.)
This is what I was forced to do:
Couple of little touches may be to:
* make a scene with controls explanation, as I also failed to read the game description on itch, so I had to figure the controls by just trying all the keys (it also may be transformed in a remapping page later). Just basic info, maybe with a little art, but most important - in the actual game.
* make resource order consistent (on the left part of the sceen the same as in upgrade popups)
All other things I found to be quite explained.