Good game. One thing i would change is the in-game achievement window. One row with 3 achievements visible at a time doesn't look too good and finding what you want is really time consuming ;(
When upgrade window is open, would be cool be able to change units. Its annoying when you have 10 units to upgrade and you have to close upgrade window, click next unit, open upgrade window, upgrade and so on...
Getting to higher division in arena is such a pain... You need to fight with ppl who have higher rating than you to get good result, but when you are near division limit you cant find any higher opponents. And then you get +1 rating for winning fight and if you lose you get -8/-10
Second badge isn't really that hard - take until 13, then 3 times get allied asteroids (so you can survive levels with those bombs lined up by throwing allies at those bombs) and speed to the end
It would be better if demon, kitsune and king had some passive skills as well. The way it is now, those heroes won't get stronger after reaching certain level.
stupid game:< i had whole states cleaned in day 30. Whole but North Carolina Where were only 5 infected people left. Nothing game enables you to do could "clean" this state and it was defeat because 5 stupid people who couldnt die in 10 days;< Sooo damn stupid....
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