Both are excellent games, and the sequel topped the first one in a good way imo!
I know they didnt expect the sales to be as high with the first one as they got, but that it were that much less sales for the second one is scary,
I still hope they can make a third one but I assume they are going for a switch+steam release of the second game first, which might also be part of the difference in the numbers.
@stehf, that interface were in the first game too, but that content at first got cut in the english version, I think it's patched now so you can see the first ones on stage dialogue now.
EDIT: rewatched the pictures, eshop downloads only!