NSP files are essentially clones of the content found on the Nintendo eShop.
Spiritfarer is a "cozy management game about dying." You play as Stella, a ferrymaster to the deceased, building a boat to explore the world and care for spirits before releasing them into the afterlife. Technical Features of NSP Files SPIRITFARER-NSP-ROMSLAB.rar
To run this file, you generally need a "jailbroken" Nintendo Switch with updated PROD.KEYS and Title Keys , or a properly configured emulator on a PC. NSP files are essentially clones of the content