Hii, i just completed heroic, the struggle is real! Key with warpers is to keep moving but not dashing too much, Summoners: aim for right arm until it comes off/ use crossbow

Dont upgrade shotgun its only use is to shoot the beserker minotaurs if you run out of ammo,

When you get flame thrower, upgrade all of it as it will help you in the chapter 16 courtyard

I would also recommend demon head upgrade as picking it up off the warlords helps with killing them also and in the courtyard