Stack mushroom and lightning towers by bringing hermit or app in as a second split.
Move gas trap on the core with jester ability 1. Jester must have 0 tower range.
Use 1 or 2 dps characters that run around, keep orges busy, collect mana and upgrade. (I usually use a squire with a ranged dps pet to agro orges on the right side of the house.)
Use 2 tower boost monk to ensure to keep the tower boost running all the time. Position 1 tower boost monk the left barrel, the other one on the hermit pylon.
Don't fight monsters while standing close to a crystal.