Seems like it's a problem with how the game's programmed. I consistently get no audio when I play the game on firefox
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Music games are really hard to nail and this game is in my opinion one of the few ones that does not throw a random curve ball just to be challenging (for example the dance floor is lava uses quarter beats unless it feels like it). There's a discrepancy between what you play and what the melody will be but I don't think it's too much of a bother.
Like others have said turning your keyboard or monitor sideways is the best way to play. All in all a really enjoyable game with a good atmosphere. And I crave more because I beat it in a few minutes...