Overall nice game. Neat idea with weapons and armour requiring different stats to be used effectively.
The downside is that with 2-3 designated looters this game becomes too simple after about level 20. At high intelligence level + double computers + hazmat suit, the looters have <0s looting time. That sounds like a bug. You might want to rethink the money looting scheme, like maybe limit the number of times a box can be looted per level.
I love the ambushes from time to time, they kept me on my toes in the beginning. Maybe you could add more of this kind of attacks. Something like zombies appearing up close, maybe some zombies that are invisible until they strike, zombies that want to mess up your car instead of your soldiers. Basically it would be great to have more zombie strategies.
Well, the game here is simply broken. I actually went to check the game on its original website... Oh, the horror!!! Game balance is a non-existent concept for these developers (in contrast to beautifully balanced Blizzard RTS). You can only afford to buy an ineffective tower (on normal difficulty) which never has enough money for upgrades, because IT DOESN'T KILL enough enemies. So you die a slow and retardedly boring death. The end. So here's the advice: even if you fix the towers not firing on Kongregate, go and please force whoever designed this game to play it on NORMAL and HARD difficulties until they realize that tower damage or creep heath needs an adjustment. As is, it's barely playable on EASY (once you get the towers to shoot at all).
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Thank you for the sugestions, your coment helps us to see better what the people want.