The majority of Nintendo Switch ""exclusive"" indies are shared with PC.
Yeah a lot of Switch indie exclusive only seem that way because not a lot of people talk about the PC release. So here is off the top of MY head, The List™ you can choose from.
Notable Exclusives Console or Truly:
Golf Story
Kamiko
Snipperclips Plus
Black Hole (Original on Ouya)
Zarvot
Mercenaries Saga Chronicles
Pode
Friday the 13th DX
Fast RMX
Blaster Master Zero (On 3DS)
Azure Striker Gunvolt: Striker Pack (On PC/3DS)
The Messenger (On PC)
Wandersong (On PC)
Marble It Up! (On PC)
Just Beats And Shapes (On PC)
Gris (On PC)
Aaero: Complete Edition (On PC)
Into the Breach (On PC)
West of Loathing (On PC)
Bomb Chicken (On PC)
Cave Story+ (On PC)
Notable Coming Soon Exclusives Console or Truly (as of this writing):
Untitled Goose Game (On PC)
Slay the Spire (On PC)
Elli
Dragon Marked For Death
Umihara Kawase Fresh!
Windjammers 2 (On PC)
My Friend Pedro (On PC)
Pikuniku (On PC)
Mineko's Night Market (On PC)
Killer Queen Black (On PC)
Double Cross (On PC)