@Belaptir One game? You kidding? Third party support doesn't mean exclusives. It means any third party game. We've gotten tons of quality ones. Indies are third party games too. Many games are also "new" to handheld.
Either way, to mention a few notable ones:
Hollow Knight
Octopath Traveler
Celeste
Bayonetta 1+2
Crash Trilogy
Iconoclasts
Dead Cells
Okami HD
Monster Hunter Generations Ultimate
Undertale
Labyrinth of Refrain: Coven of Dusk
Valkyria Chronicles 1+4
Armello
Towerfall
Dragon Ball FighterZ
Disgaea 1 Complete
Dark Souls Remastered
Starlink
7 Billion Humans
The MISSING
Transistor
Bastion
Diablo 3
Warframe