Need improvment.
The hero is essensial in this game, and not much on the towers. The tower is kinda useless takes almost none damage if you don't uppgrade them but the uppgrades is expensive too. The element thing isn't clear enough, like have the monsters no weakness?
The controls are bad, you must klick on the minimap to go somewhere, no zoom out function, if you miss the aura things you deselect the hero.
Music is repetative, and not even a special boss song.
I think this game is more of a RTS than a TD.
Concret things to do to improve:
-When you move the mouse somewhere you go there and not the bad cursor buttons.
-More hotkeys, like EMP-"e" hotkey. Powerup number one on the list "1" Select hero-"h" and towers-"t"
-Better tower/enemy/upgrade balance
-Get rid of that submeny when you select a tower.
On the bright side this was a very fun game and time killing.