Seven years later and this is still my fave Switch game.
@Secret_TunnelYeah, the co-cap mode is surprisingly decent for what it is. Obviously not as good as if both players could control their own character like Mario and Luigi or whoever, although I'm still unsure of the logistics for that in a full 3D game. I've also done a co-cap playthrough with my significant other and it was pretty fun, certainly a different experience than normal. Trying to coordinate things like cap jumps and captures and such can lead to some pretty hilarious moments! It's interesting how some things become easier and others, much,
much more difficult...!