nice, but not great.
* You only gain mana by killing something. When you're on a level where you can't kill anything, you're toast.
* Experience is so slow, that you almost never level up. Why bother?
* Cost of the heavy hitters is so high, you're lucky to be able to place one at all.
* It's all too easy to place a guy in the wrong spot, and there's no cancel option. Money lost forever.
* It takes so long to place a guy, it's often that the creep you wanted to kill with him is gone forever.
 "Steambirds: Survival"){kind=icon}
 "Ultimate Defense 2"){kind=icon}