This is a perfect Kirby game, I think. It's beautiful, it's silly, it's got fun level design, and it goes completely bonkers in the final hour. In true Kirby tradition, the final boss is "give the controller to an older sibling or a parent" levels of difficult.

This is a great game to play with a young child, and the co-op mode is one of the best I've seen for that use-case.

Though the game is pretty easy, I think it's also very enjoyable for an adult Kirby fan. As I mentioned, it's a charming and beautiful game. There's also replayability for each level to complete specific challenges, many of which are actually challenging even for more experienced players.

There is also a post-game area that features a massive difficulty bump, which should be satisfying for players wanting more of a challenge.

In terms of importance to Kirby's lineage, I'd compare this game to Mario Odyssey. I think it's genuinely a really wonderful experience for anyone who likes Kirby games, but it is especially good for children and adults (or just older children) playing with young children.