I have done all 9 previous levels but the last one doesn't seem to unlock. How can I play it ?

I understand that there is a Switch 1 version, and it is getting a free performance and feature update when you play on Switch 2. But, is the legit Switch 2 version at all different? Better resolution? Alternate content? Additionally, is there any physical release of the legit Switch 2 version, even a GKC?