This game had what it takes for a 5/5. Unfortunatelly there's no explanation for what more than half of the things do, so you are left guessing which detail that was left out is crucial for the mission you are facing. This is good in a puzzle game, not a strategy game.
My advice is to get all coin upgrades you can early on. You are soon getting enough cash to buy 2-3 upgrades per run. Once you finished the tree, ditch the coin kongpanions and max out your rocket and bounciness which makes getting long distances much easier.