Great game, addicting.
I must say that honestly, I was addicted to this game for quite awhile. Once I got to the level where they started building catapults, it got a bit more tough. I don't think there were any hotkeys, so that would be useful for the Bubble, Booger, etc. It was troublesome having to go back and forth throughout the game to click on different things when you're being pummeled(such as the bubble). Also, after the desert area the game seemed to have a steep difficulty jump, maybe tone it down a bit?