I'm missing a "not my audience" vote option. I don't want this to sound condescending, but there is no way around this: this is a game for girls and women. The yarn, the cutesy graphics, the amiibo, the easy difficulty level...and I bet there'll be more that is straight up copy-pasted from Epic yarn.
There's certainly nothing wrong with that. In fact, Kirby epic yarn was a babe magnet. Despite it being so easy it was retarded, the co-op was actually kind of fun in a "let's explore stuff!" kind of way.
Girlfriend: oooh...this looks cute.
me: yeah, it's pretty...but can you get over here? There's this ledge I want to climb and I need you for it.
girlfriend: just look at this: it's wonderful, isn't it?
me: *nods, has seen it before*
girlfriend: you want to go decorate the house?
me: okay, that's IT! *jumps over, whips girlfriend's Kirby into a ball and throws her where I want to go*
girlfriend: hey!
me: there. now THAT's how you treat women!
girlfriend: lol.
So...yeah. That's the sort of conversations we had (which was exceptionally funny because Kirby is all joyful and that prince has this angry-sort of frown on him).
if it's anything like kirby was than NO
I think the trailer answers that more than enough. And while they don't say it, I'm sure that 'mellow mode' just means that getting hit means you lose some jewelry if you get hit. At least there IS another mode now.