You've got two main options.
1. Play carefully, try to have a health item (ambrosia from Wallace's Secret Shop is the best option, but very expensive) ready going into the fight and be extra cautious in the fight. I found Ramona's
attack to be especially helpful with defeating his Demon Hipster Chicks from a safer range. It's not too hard to do legit but you may want to wait until you've enhanced your stats and leveled up some.
2. The other option is to use the Power Of Love sword. On the title screen enter
and listen for the chime to confirm you entered it correctly. You'll now have a powerful sword with a huge ranged attack that should make your life much easier!