Too easy, needs a Menu button in game with a restart button. Support towers give unit improvements but you have no reference to units because towers use bars not numbers. Support tower radii are unclear if its affecting a tower (maybe give a highlight of affected towers?)
BS, the sway has nothing to do with the stability of your tower, its totally artificial. Its either a lazily/sloppyily added challenge or a poorly thought out one. This needs to be fixed.