not very far yet, but so far at least, pumping the hell out of the archer bunnies works wonders......advance paladog to right by the cave, use fist spell to push back enemies spawning, and crank out archers
when you can afford it, the m16 is your friend XD fully upgraded = high fire rate, high damage, high accuracy, with laser sight attached......just run back andforth mowing down penguin, polar bear, and eskimo alike
overall a good game......imo, the best method is to focus on the tank more than the base......add more weapons before putting too much into upgrading the weapons themselves, the extra rounds being put out comes in handy........as for the turrets, get both before doing too much to upgrade them, then boost range before power.......once you do eventually have range maxed out, they'll hit just about everything, and once damage is high, those little buggers will help a lot
personally, i like just upgrading the hell out of the laser, along with some upgrading of the lightning and sawblades....then once the laser is done, a couple armor boosts, and then finish up the sawblades....really quite deadly before the claws even get a hold...thwe laser alone will take care of the majority of fire from enemies, making armor less important :-P