I love the exponential nature of the game. Buying upgraded equipment and watching as your earlier investments compound. There's also an amount of nuance, once you buy too many of one thing, the price goes up, but then once you buy enough of the next level up, the price is so high that it makes sense to buy the lower-level item again (hope that makes sense). I do wish that there was a way to get more points per click, because clicking becomes useless once you buy even a couple trees. Nice job!