Great game, really challenging. The levels are really creative. Might be better if the towers are more unique: archers and mages only differ in attacking type. I'm only half-done with the game, but suggestions! Maybe some tower-upgrade split? That upgrade wheel has a lot of space for it. A speed-up button would be nice as well.
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 "DIAMOND RUSH 1"){kind=icon}
 "Swarm Defender"){kind=icon}
 "Giants and Dwarves TD"){kind=icon}