Fun game, pretty simple but that's okay. Put three fire rate buffs and a damage buff next to a heavy cannon, and it pretty much ate up everything at that point. The exponential income system is interesting but it's going to be hard to balance; I didn't have any trouble but if I did having invested slightly more resources earlier into mining would have been the right decision. As it was I stopped mining around wave 11 or so since there isn't really too much to spend the enormous income I had on besides making the tower pretty.