I just don't see any progression that is worth me playing. Bandit wins them all for me and you get it from the start. Some of the classes you win are just lame and there is a serious lack of variety in levels 2/5, but an honest attempt!
At first glance, it's far from being the best tower defense I ever played, but have to admit that so far presentation is flawless 4/5, but I might reconsider in the near future!