Couldn’t play in Firefox or Chromium: after pressing start, there’s only grey screen and music playing.
That's interesting thanks for letting me know, can you tell me what versions of the chrome/firefox you are using please?
I've tested in up to date chrome, firefox and edge and it's all good here.
I tried the following Linux browsers, getting the same behaviour:
I really appreciate you taking the time to let me know this, thanks again :)