No, no, no...
This doesn't work. It has no structure to it, your just rehashed a game that's wearing thin (Bloons) and combined it with a genre which can be described as a waste of time at best. Difficulty of the terrain is random with no progression of getting more difficult with time. The only thing that does is the speed. I'm a fan of bloons, and the accompanying tower defense games, but this is crap. Get more creative, branch out. Make something new, or soon you'll find yourself doing a bloons themed 'escape' game. It can't end well.