And maybe instead of an update-able "skills" try unlocking new towers? Idk this game looks nice.. but fails to compare to most TDs. To the developer- If you need inspiration, go play Vector TD off of Candystand.com (best TD game imo)
game would be nice if you could right click to walk in the desired direction that way when you are a wizard you can use your off hand to only switch spells not have to run around.