A nice game, bloons tower defense 3 has always been an awesome game that I would come back to time to time a fun series of games. The art is nice and there is a lot more upgrades, monkeys and features that keeps you in the game instead of being bored. The only thing I didn't like about this game is the signing in feature where there was a bunch of other items, characters and upgrades if you sign which annoyed me a bit but not that much.
In conclusion it's a great 5th game, I hope you make a 6th.