Ohh... twenty games later and I realize they're CONSUMABLES. That's... not very apparent. Especially since clicking on most interface elements will whack the ball. Might want to make that more apparent somehow. I thought I was buying permanent special abilities.
Not getting the whole 'powerup' system. They're all very cheap, but you have to unlock the better ones before you realize that you can't sell them? And once you have three, you're screwed?
Monsters are attacking? Bring me my abacus." "This is hardly the time for games, Prince Trey. And why are you wearing a wooden shirt?" "BRING ME MY ABACUS!
Missed! Missed! Missed! Missed! Missed! Missed! Missed! Missed!... There's only so much of that I can see in a row before I have to stop willfully suspending my disbelief.
My strat for the early levels; large 1-way towers on the sides, pointing inward. The bottom block is either wood, eye, or booster depending on what the level calls for. The next column in, 1 topshot. Between those, sticky, dual, topshot, or cursed.
In all, a pretty good top-down war-game. I'd definitely work on improving the AI. When someone's shooting your tank, you don't just sit there and wait until they're in range. ;)