All in all very good game! Maybe add the ability to see how much money you have while you are in the shop.
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by the way, would you like to collaborate with me? We could make a Lumber Company Tycoon 3D game. I recently programmed an asset for Unity that would allow us to make a random world and then add a shop, different worlds with different types of trees and more... (procedural). If you use Unity of course (: