Thanks for checking out our game! Yeah I'm not really sure what caused the audio issue, I was kinda disappointed about it because our musician put his time into it, it's weird because it works perfectly fine with the download version but it breaks on web.
Coyote time is something we forgot to implement due to lack of time, but yeah I think it would've helped a lot. I think that if I had the time to go back and change things I would've definitely made the ghost platforms easier to get onto, it's specifically spikes that are raised which have a slight problem.