Great Game. I love it !! A minor annoyance though:
On extreme track, they charge 25 monkey money per attempt and tell you that you get ninjakiwi coins on win and when you win there are no ninja coins. Don't get fooled by this, you cant use these coins to buy premium upgrades on Kong. I wonder why devs have kept this track on Kong when anyone trying this will end up frustrated. (+ so everyone can see it)
There is a bug (or feature?) in game. If you directly buy third upgrade, you save money by leaving off second one. When you buy 2nd upgrade first and then third, you pay upgrade 2 price + upgrade 3 price.
 "Bloons TD 5")
 "Earn to Die")
 "Legend of the Void")
I'll look into adding this.