Updating my take: changed browsers from Safari to OperaGX and I actually get the audio now. Quite good tbh. Boss is still unkillable so the game is in an unfinished state.
nevermind, I saw what it was. I had a beta version that makes it do 50 damage per shot and when I wanted to put it back at 5 instead of 50, I got rid of the 5 and made it 0 by mistake......