Meleeing this boss is actually fun. The only real issue with the fight is that the mushroom AoE circles inflict damage immediately on appearing rather than giving you a moment to dodge. The line AoE has a very slow windup and you can simply walk out of its path, and the boss has a pull attack that will target ranged characters and yank them into the AoEs anyway, so why not already be in a safe melee spot to avoid that possibility?