amazing game 5/5
although, I think you made zombie wrath a little too strong...
If you just make all your equipment have level 1 manatotal, youll be able to cast zombie wrath continuously on dragons, knocking them back. when they reach you again, youll be able to cast zombie wrath again.
Therefore, the dragons will never be able to deal you any damage.
@phazm: i always put a temple on it, and make it a burning temple on lvl 3... big damage, big range:) ninjas are affected by it when they are in range and a non-ninja unit triggers the tower...