I was a BT as well, and I believe numerous other BTs mentioned that the game was too easy, and I'm pretty sure GAMEVIL addressed that problem in the submitted build.
Oops. I forgot to post a link here. Already out in NZ (probably in Europe too now) TA thread : http://forums.toucharcade.com/showthread.php?t=36513 iTunes Link: http://itunes.apple.com/nz/app/boom-it-up/id342657931?mt=8