Jupiter's Picross games were an absolute favourite of mine whenever I need to kill a few minutes and I'm in the mood for a puzzle. The first interation of the series on Switch is a solid Picross game with no real bells and whistles to speak of if you're already used to the 3DS entries. If you want to play Picross and nothing but Picross on Switch, this is a no-brainer.
Sadly, unlike the 3DS entries, Picross S does not support touchscreen usage in handheld mode which is a real shame if you have a stylus handy. The button controls work just fine but if you specifically want touch controls, you won't get it here.