Thank you very much for the feedback.
Regarding the music, I can confirm that it wasn't a browser or computer issue. I had problems adding the loop and couldn't fix it in time. I will try adding the loop again after the voting period ends.
And about the health bar, I totally agree with you, it's difficult to notice when you get hit. I intend to change it in the future, especially the color difference with the background. Thank you for pointing that out.