Copy Wolf4SDL.nro to /switch/wolf4sdl/ folder
Copy wolf3d folder from your Wolfenstein 3d install (Activision/GT version) to /switch/wolf4sdl/ folder

Sound has a few issues causing crackling and popping.
More releases are planned shortly.

Keys	Controls
Up	Forward
Down	Back
Left	Turn Left
Right	Turn Right
Minus	Return to Menu/ESC
A	Fire/OK
B	Open
X	Strafe
Y	Run