Thanks for checking it out and enjoying it :)
Yeah I've noticed the playback can sometimes be screwey. There's clearly some elements of recording sounds in Godot that I haven't yet been able to fully grasp. For example there's two types of AudioBus Effects for recording from the microphone, the documentation doesn't really cover the differences between the two, but one works in html and the other doesn't. Other Bus Effects don't work depending on filetype either. I'd like to of cleared out all the bugs like that but we live and learn.
Future me will know what to mess with when I make Clef's Quest 2 in some future jam :P