I just got the Cuphead platinum last night (Deliberately avoiding all DLC content to ensure I didn't make it easier on myself since Ms Chalice makes the base game easier due to her extra hit point AND dash-parry, AND her invincible dodge roll AND the fact that she has all of these boosts without losing any of her strength.)
Now that I got the base game plat, it's time to do the DLC.
My Console Library:
PS5, Switch, XSX
PS4, PS3, PS2, PS1, WiiU, Wii, GCN, N64 SNES, XBO, 360
3DS, DS, GBA, Vita, PSP, Android