Out of the games on the list, I'd personally say Shovel Knight is my favorite. I have the 3DS version because of the 3D effect, but obviously it would be a great game on any console. Total masterpiece of retro game design and they're STILL coming out with free content updates!
I have a cousin that swears by Binding of Issac, and I've heard really great things about Celeste, Hollow Knight, and Stardew Valley as well.
Can I also make a suggestion? Golf Story is a wonderful little game exclusive to Switch. Golfing and RPG mechanics seems like an unusual combination, but it works so well. Golf Story is full of humor and charm, and it keeps you engaged longer than your typical sports game. If anybody played the Mario Golf games made by Camelot on the GBC or GBA, this game is highly reminiscent of that style.