The only thing I miss (strategically speaking) in this came is the ability to have towers target anything other than the enemy closest to the entry. especially in the last boss level, this is a serious deficiency. Other than that, nice and fun game.
Winnin on the hard/impossible difficulties: win a match on the easiest difficulty level, train (in schools) five of your people until they get a 'perfect 10' in all capabilities, send them to a new small city.
For some reason the game stuck at the Tunnel beast: it loses 10 focus as if it's doing something, but nothing happens and the game cannot progress. Damn.
The trick to a successful weather balloon slaughtering is juggling lots of hail: don't get obsessed with making a 50m+ piece, but throw as many as you can as far as you can. When they come down they'll clean the screen for you
The reduction of eviscerate was a little excessive. Both crit and damage are too low. I would say that crit ought to be some 50% or so, and damage maybe 26 or something like that.