My only qualm with this game is that the buy button doesn't stand out and I don't know how many times I've accidentally hit the play button instead of the buy button.
I don't know if this is happening to anyone else but when I face the Hydra x10 and I only have 5 remaining, I frequently can't seem to hit them. I'll punch, but I won't do damage.
 "The Peacekeeper"){kind=icon}
 "Super Duck Punch!"){kind=icon}