Needs a super rare extra tough golden slime that prefers to spawn in the treeline last.
I think this is the rare occasion where 1 currency isnt enough as its just snowballs into mindless clicking. Maybe another slime that drops crystals that are used as a separate tree for the purely money upgrades, which wouldn't be essential. So the economy does not go 1-100-10k-20M
Right now its not a tree, its a rail as you can't really skip anything to progress.
But the style is great. Love the capybara chilling. Just more interactivity needed.