It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

I occured the audio bug in the steam version.

Is this fixed here?

The problem ist, that the game shuts down the whole audio. Silent as pushed the mute button.
It has something to do with 44kHz parameters. Maybe, dont know, could not fix it.
Dunno about entire game, but i just completed entire 'Act I' without any issues.
Everything (sound included) works perfect for me.