It's a fun game, I haven't even gotten into battle and I've enjoyed it quite a bit.
The music is nice, the just ability to idle also is great.
Coin upgrades are well spaced and obtained with a bit of work nothing to extreme which adds a good factor to the game of not needing to grind for endless amounts of time to do anything.
Battle: Simplistically good and fun again adds to the lunch break style game play this is good for and does well.
My one flaw and it's a BIG one is the memory eating this game has, it REALLY needs a quality button. I'm having lag troubles with it due to flash eating so much. Could be something in the code as well, but either way a fix is something to be looked at for sure.