Perhaps Photon (the networking service used by the game) was unreachable. I haven't seen the code in years so I'm not sure about the possible failure modes anymore 🥴, but as far as I remember this one didn't have a bespoke offline mode like the original Shenanigans had.
Recent community posts
could you document your issue on video? Also, try using various display modes - fullscreen, windowed, and different resolutions. I've seen Unity UI get confused on stretched modes, for example.
Note though, that I haven't really tested the game on Linux, but so far nobody had reported any issues to me, so perhaps it varies from distro to distro.