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Thanks for taking time to play it and for the feedback! I've had a look at what could of caused that for you but everything seems to be working fine every time I've tested it. The music is all there but I've updated the game to preload the all the music at the beginning so it should activate more efficiently now. GDevelop doesn't work as perfect as other game dev software but I still really enjoy making games with it.
I didn't touch the image files, I just updated the music loading. It's strange these glitches keep happening for you, it works completely fine on mine and several other friends I've sent it to. It could be your browser or your computer just doesn't like it lol.
All the levels apart from the completion music and intro music are by the artist I linked on the description page for Magenta Six, you can download it from there and credit them to use it.