Thank you so much! I was a bit afraid that the game concept was a bit abstract, especially without sprites. And demanding a bit more time to get to grips with than a game jam player would be expected to.
FMOD. Yes :) I had a bunch of library code that I thought I was being oh-so-clever by slotting in and literally having one-liners to play FMOD events. That Saturday debugging session was an ouchie. At least Unity webGL publishing seems miles faster nowadays.