Love the Bloons series - only issue. It wasn't anywhere near long enough. I didn't even get all of the upgrades. =\
Not sure how you would pull it off, but adding a health bar and bosses would make this game even better.
Can't say I enjoyed this game much due to playing bubble tanks tower defense earlier... This game is a ginormously large step down.
As far as criticism goes... Amazingly poor design of the maps (function wise), graphics were weak and not enough tower options.
Bosses were a nice touch, but the new format of running to your next area is meh for me. I also had a lot of fun with the old level selection.
Still gave it a 4/5. The old was an easy 5.