Rising defences

First of all, I played until wave 30, so it is a very fun game. But there are a few problems:

• I can only click the text on the button, not the button itself
• The  pixel resolution of the characters is different, and the art could be better or more consistent in general.
• I don't have the feeling that the characters are balanced right now. The axe man feels overpowered compared to the others, and the mages are too weak I think.