I think it's less a problem of enemies being too tanky or too damaging, and more a problem of throwing too many enemies at a player who is really only equipped to take on one at a time. I could probably get through it by exploiting the AI, trying to lure them over to fight one at a time, but that would be tedious, or getting them to bunch up and circle around them safely, which would be inconsistent and tedious. Something with AoE damage would really help with those big mob fights, to quickly whittle numbers down to a more manageable size.