I'm so glad to hear you had fun! Yes, I did use FMOD to implement the sounds & music, but we forgot to list that in the description.
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Sad to hear that.
It's probably because of loading. You need to load all sound banks asynchronously manually in a scene before the main game like in this example on their official documentation. This is because in WebGL FMOD cannot do multithreading, which it uses to load the sounds every time they're first used. I hope this helps you in the future.