Welcome! I'm glad you like the project :)
Currently, PQ93 is very young, obscure, and prototypical, and needs a lot of polish and bug fixes. I haven't seen any PQ93 games posted anywhere.
For the Linux problems: I think my AppImage is borked. I have not had an opportunity to fix it yet. When I have an appropriate chunk of free time, I will attempt to fix the Linux build.
Currently I can make no promises about when that will be.
Apologies.