4/5. Would have been 5/5, but why so short? Make a second or upgrade this one, at least 25 new levels and harder things to destroy! =D (may I suggest seperate heatseaking weapons just for aircraft? the night helicopter would be fun as hell to kill for major $$$ bonus)
This is what I did to kill The End: Upgrade everything to full. Autoshot set infront of their tower, constant fire/lightning/frost arrow, send 1-3 angels to kill them, The End comes, send out angels angels angels, keep shooting him w/ frost, fire, and lightning, keep up a steady stream of elves and hobbits to slow him down (they wont hurt him, but he stops to shoot)