A splendidly made game. I normally don't play tower defense games, but this one is exceptional. The pausing feature really helps me to think bout my next move be well organized.
I absolutely agree with everyone in the comments. People should be able to earn credits without paying. I'm not saying that this game doesn't deserve it but most players would be left out from most of the features.
5/12/13, My first survivor survived through 20 waves of random zombies, Both of us fell in love with each other. We have been dating for 3 weeks since the "escape". After thinking overnight we've decided to have a gay marriage.