If ur high stats --->  dont use hermit towers just stack LightningTowers and do a reflect wall in front of LT stack 

also decrase the size of  the slow aura with the button - to make ur runtime faster

If low stats and problems use spider minions  behind the walls 

i use 4 heros from start 

 f2 mana summoner to avoid tb from cooldown (that ofc is not needed  im just lazy)

f3 tb monk 

f4 upper girl i just  let her run ability and mana summoner drops her mana to upgrade automatic

f5 app builder for tower dps bonus also ----- >   if i reset run i just build app stack with him on f5 to save time  (if i reset run i dont delete any heros so i always farm and build with 4 heros xd)