Thanks for the comment! I'm absolutely going to put out an updated version after the jam, using Godot 4.3; I hadn't realised how much of an issue the whole SharedArrayBuffer thing was going to be.
Sound options are absolutely on the list of things that will be going in -- I had meant to add them, but time is finite! Adding more puzzles should in theory be pretty easy, so I think at least an expanded version is certainly on the cards.