I love how dynamic the opponents are, this is something I haven't seen in this genre before. Normally it's just a different attack but the swooping witches and sliding turtles liven up this somewhat older style of game.
Few things though, I'm not sure how its fair that enemy units only deal one damage while I can deal much more, and that sometimes my units slip through uncontested because of lane swapping opponents.
There is only one problem to this game. And thats you get the good armor for the area, after you beat the area. No one needs frost resist in a firey place
:)