I bought it today, played through it with my youngest on easy, amazing!! Now on my own on normal, I'm rusty!
It's the best of nostalgia modernized for today, great for young and old. It supports up to 4 players couch co-op or vs mode. The only problem, my kids fighting over the stars for the special move haha. You can turn 'friendly' hits off, that saves fights spilling over onto the couch :)
I really love the art style, looks great, music is great, loads fast, everything feels very polished. Highly recommended.