Bosses shouldn't spawn as black (universal) type. Total immunity to all elemental types makes them massively difficult compared to any other boss, and elemental pierce doesn't scale well enough to reliably deal with them.
I...I don't even know where to begin with this. There are just so many things absolutely, unquestionably wrong with this game. It lags like hell, the combat system is ridiculous (d100s with set to-hit chances and damage based entirely on RNG rolls, what the hell), there are about a hundred different pointless skills and buffs...have you ever even played an RPG?
10/10 can finally realize my dream of playing shitty early-2000s garage rock in a laggy Guitar Hero clone with nonsensical button assignments and a completely counterintuitive UI layout.
Jumping enemies (werewolves?) are so absurdly overpowered, especially when you're swarmed with them and shooter zombies. Anything with a stun ability, basically.