Fun and better then the others
I really like the game and the fact that you can unlock more upgrades made me want to keep playing. Getting the mochi account took like 2 mins and it was FREE. No one seems to be reading that. You don't need to buy anything, you can unlock most of the game by playing it through. Think of the coins like an optional expansion pack that improves an already great game. Halo maps anyone?
It is pretty slow at the later levels put that's to be expected with 1000's of bloons per level and a ton of super monkeys firing plasma lasers.