it's not copying, it's adding a melody to another song to show the characters are related, and if he was copying at all it would be Ghost Fight he is copying because that's where we first hear the melody, almost all songs that uses the melody of ghost fight are used in the themes for characters related to napstablook, Mad Dummy/Mad Mew Mew is his cousin and so is Mettaton, not sure why spider-dance though, maybe mettaton higher muffet to get frisk
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