Great game but way to easy, just as others I'm a fast typer too, I didn't have any problem at all with any level. Just spawn one special unit and missile the hell out of the castle afterwards. I give you 3 points for originality, 2 points forthe way your game came up. -1 because it's to easy, so that gives you a solid 4/5 :P
@skrooq, you get more then enough money ... as long as you don't buy the useless stuff ..., don't buy mods, you only need the armor piercing mod the others ... didn't even look at them made it trough the game with ease ...
the weapons are unbalanced, some weapons own like the m4 but others are very expensive and pretty bad, the grenade launcher is one of them. Also the nuke is worse then the satillite rain ...
make it a bit more balanced and make weapons a bit more to fit their value
the fun thing is I keep pressing up though to see if I can get a heavier zombie, you get 5 points for the idea -1 because it has no upgrades and another -1 because it's the only lvl