I'm playing on mobile on the browser version. After I went through the kolbold cave for the first time the music stopped and I couldn't do anything.
I can have a look and see if I can replicate the issue, but it might also just be cause it's on mobile, since it wasn't designed for it.
I just found it. It's not the kolbold thing. It's whenever I press the I button. It looks like a uppercase I and it mutes the music and freezes the game