I read through the posts and didn't see anyhting about this so here goes. It looks like the Linux build has the Windows JRE packaged with it. which when run results in
Loading JVM runtime library ...
jre/lib/amd64/server/libjvm.so: cannot open shared object file: No such file or directory
Error: failed to load VM runtime library!
Of course this makes sense, as the files aren't there. Also I can run the game just fine via the .jar file using the system installed java.
This is a really neat game, keep up the great work.