Hi! Thanks for checkout out the project.
If you're using a Steam Deck, PJSF works for me when using Proton 7.0-6 specifically. I am not sure if it will work the same for you but you might try different versions of proton (Game Settings - Properties - Compatibility - Force the use of a specific Steam Play compatibility tool).
I will look into the requirements for a Linux build. I am entirely unfamiliar with the system and it's requirements outside of Steam Deck desktop mode but you're not the first to request a Linux build so I will see what I can do.