Game really needs more water-based towers... For one thing, there are many levels that are nearly impossible with the limits, and for another, a good 1/4 of my map is water... and I have nothing to build there, having hit the buccaneer and water wheel limits long ago.. Alternately, some sort of raft and pool, such as you could buy in previous bloons TD games, would be really helpful for a lot of the maps.. otherwise good game, just.. really hard..
I'm also having a problem with using the max upgrade button and going into the negative, sometimes without even getting an upgrade out of the deal... Also the straight-shot (straight-line) levels are absurdly difficult, so much so that I've been stuck on the same one for several hours, and can't figure a decent way to prevent any of the swarm from reaching my goal within the first 2-3 waves (or even a way to keep enough of them away to just pass the level)
I like the game, but I don't like being stuck on a level that I just can't find a way to beat, no matter how many different strategies I employ
I beat some 6 or 7 monsters and then.... I'm just stuck on the screen with nothing to do, I couldn't unlock any of the extra powers listed all down the side, nor do I have a clue as to how you'd go about doing that.. It might be a good game if it didn't just go nowhere... :)