interesting. Gets harder around the low 30's. Here's the setup I used to beat all 40 levels. 6 gunners, 4 heavies, 8 repairs dudes, 2 machine guns, 2 cannons. Get up to 6 gunners first, then build up repair, then heavies, then buy 2 machine guns, and then 2 cannons. With that many repair guys you can heal up you walls really quick. good hunting and Enjoy!
oneyedog, yeah I think it's cheesy, maybe they could add some code to detect "suspicious" wins/loses. check on account with 0 wins, see if they lost to the same player all the time and remove, or reset that persons deck.