If you like puzzle games like Sudoku kinda thing then the Picross S games are great on the Switch there are 4 of them, 1-3 and a kemono one or so which features little anime girls as animals to draw... they're strange games but there is a demo of a thing called pic a cros (or very similar) which will show you the type of game it is, if you wanna download the demo of that, but don't buy that, buy the Picross S titles, they're way way better for the user controls imo.
Rogue Legacy is a great way to lose 50 hours or so if you get into it for €15 it's a 2d rogue dungeon exploration game where the castle you enter changes each time you die and so does your character (a little bit) but you have to do more and more runs to collect items and gold which you can use on your next play through to try and get further in and kill some of the best and hardest bosses I've played in years. I've platinumed this game on both Vita and PS4 it's amazing.
If you wanna not spend money and have 8gb of space free on the Switch and want some Overwatch action, download Paladins on there, it's a fantastic free to play team based shooter with a crazy number of characters all of whom have unique abilities and their own charm to them, I originally just got it as a way to have overwatch on the go but now Overwatch is just for late night sessions with pc friends where as paladins is....
Paladins is great lol....
Why not check me out on youtube and help me on the way to 2k subs over at www.youtube.com/stormcloudlive
