This game is crazy unbalanced, I suspect devs want you to buy things with real money to progress. This is actually ridiculous, everything in store costs double your money, chests give you like $13 each, this game punishes you for playing.
What happens when you get all of the circle things? I was missing one and it may have been blocked off since there is a point of no return once you start using the gnomes.
You just get a higher score in the Kong leaderboards, nothing else. And you get a sense of fulfillment, if you're a completionist.