Wave 32-35: Run Tb shooting one of the spawns for mana tb will prob drop on the last couple harbs because their spawns are so slow but its fine also run upgrade adept and max all towers on wave 1 can also upgrade on wave 2 if needed but after wave 1 i usually keep my tower booster in then run an adept bomber with a huntress guardian and just put ontop of the seed bombers and then afk with tb and the bomber till wave 35 

Wave 35 : i bring in 4 adept bombers with guardians 2 huntress 2 apprentice all sit next to the seed bombers u dont need to use the purity bomb at all i just use bombers because more tanky because the harbs will hit you a little bit and wave 35 is full afkable no bombing needed 

(This is just a modified version of sigs build his build works too)