I have seen a thumbnail of that one video. Interesting to think of if they were to exist for the public. I feel like the brand wouldn't be looked at the same and instead would be thought of as very experimental like other IPs. Maybe because it strays from the regular gameplay it would rather suit another IP that specialized in those gameplay structures or elements like Fire Emblem. But spin-offs as they may be do vary. As we've seen in Smash Bros., Tingles standalone Japanese exclusive for the DS, Picross, and the Warriors games.