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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.