So I played this at Hyper Japan as well and there was one tidbit not in the OP I wanted to mention here, how Dry Bones looks -
Older Mario games were pretty inconsistent about what certain enemies looked like, and that kinda got "ironed out" as the series progressed and designs became more standardised. Seems like this game is keeping a few of the weird enemy designs instead of trying to modernise them. I like that a lot. Also the game looks really great on the 3DS screen and I like the QOL improvements from Paper Jam returning here (fast-forward, optional tutorials).