Hey Faux! aGlitch here. Thanks for playing :) The timing of your post is super funny, because I just fixed the demo builds.
It appears that something in the upload process caused that audio glitch that you mentioned, as well as another bug in the overworld menu that prevented access to the last 2 levels of the Demo.
I'm really really sorry for these issues, they've been fixed now. Hope you can finish your playthrough now.
Thanks for the kind words and the feedback as well! I'm writing down everything so we can fix it in the Early Access builds. I'm super happy you enjoyed our game. We really have a ton of fun making it :)