Ok i admit i thought this was a good idea. It's not.
I believe higher DPS and more aggression from enemies is the way to go.
Edit: scratch that i think the best way to add difficulty is to just add modifiers and restrictions to the player and don't touch the NPC. Plus NPC RNG behaviour imo the best?
-
They think that increasing enemy health and damage is difficult, no it's not! You increase the difficulty by making the enemy smarter, more dangerous, aggressive and defensive in the right moments!