A little update, it's possible to appeal to the (false) copyright claim of this song and win over the copyright abuse (by simply just adding the name of the song and the author in the video's description), still it's annoying when something like this happens, make sure you always credit the musics used in your next games! And maybe put a warning about this issue when the player boots up the game for the first time or sth.
Cool! thanks for the tip. I originally found the song from here where it was used as the intro song I think? (though I do also use pixabay ocassionaly) https://twoandahalfstudios.itch.io/a-date-with-death I'm very sorry about the copyright issues, I did my best to make sure all songs were free to use but I guess it's inevitable. Hopefully I'll be able to make my own music soon because nothing terrifies and annoys me more than copyright