Heres some screenshots 
Hey, that’s unfortunate! What Linux distribution do you have, and what is your hardware? If you can capture the command line output from the beginning that would also help. It seems like the shared library is not loading on your device for some reason.
Regarding Chrome OS, is the whole landing page showing up blank or does it turn blank after you try to load the application? I ask because you should see at least the landing page itself, since it’s just a regular web page, and if it breaks at that point, this is not about the application itself. Could you open the devtools and see if there are any messages there?
Edit: Also you mention that the web version doesn’t work on Chrome OS, but what about Linux? Have you tried it on your Linux machine, in either Chrome or Firefox?
Thanks for more info!
So I assume there is some JavaScript error on your Chromebook that prevents the page itself from functioning correctly. Unfortunately, without any knowledge what that problem is I wouldn’t be able to address it. Maybe somebody else will face it as well and will be able to poke deeper.
Your Linux setup seems fine from that description. It would be nice to see the entire error log though, could you show me what it prints from the top? From what you’ve already shown, it’s clear that the Godot runtime is operational, but the synthesizer library is not loaded for some reason. That’s very strange, and the only thing I can think of immediately is that it’s some permission issues.
Make sure that the .so file that comes with the Linux version is accessible by the same user who runs the Bosca executable. A library file like that normally doesn’t need an execution permission, but maybe it does in your case? Worth checking this as well. The ZIP already should have correct permissions otherwise (sans the user, of course), but if you unzip it on one machine and then copy to another these permissions can get lost in the process.