I have quite a few third party games as I like the idea of indy games on a portable console rather than my Gaming Desktop/PS4. Most of them I could have bought on Steam or something for cheaper, but portability is a huge factor for me. Not sure if they all count if they only appear on the Switch but are third party devs but I still will include them...
Disgaea 5
Minecraft
Shovel Knight
Snake Pass
NBA Playgrounds
Binding of Isaac
Has Been Heroes
Mr. Shifty
Wonder Boy: The Dragon's Trap
Puyo Puyo Tetris
Shantae: 1/2 Genie Hero
Not Sure If Counts
Snipperclips
Super Bomberman R
Blaster Master Zero
Tumbleseed
Fast RMX