so uh I'm kinda embarrassed it took me way too long to beat the catgirl she kept beating me because her bullet hell out matched my dodge frames never had that happen before so of course i did her last and she took 4 mushroom soup and 2 uses of the mushroom umbrella healing more healing than any other boss.
I figured that out and i kept getting hit after healing as the healing is a bit long but a suggestion i would make is buffing the wooden sword as the whip is faster and a longer range and i quickly found myself never using the wooden sword and it puts you in range for the idle damage of the enemies weapons which isn't wanted for such a fast paced game unless it's a challenge run kind of thing.
Oh yea don't shorten healing times unless it's an item as it's a risk reward thing.