Thank you! I did so much research for this jam. XD I wish I'd been able to represent it a bit better. I'm hoping I can update it so it's more clear that the minerals are being freed for use by the trees and traveling through a network to the tree roots. For now it had to stay abstract.
Yeah, the option to buy more energy was a rushed add I didn't get much time to think about design wise. I'm going to consider the energy budget and economy going forward. I basically didn't want players to be locked out of succeeding, so I figured paying for a bit more energy to finish off a tree might help.