Hello! The music used was created by a user named 'Rockot' and uploaded to pixabay.com (https://pixabay.com/music/beats-dark-cinematic-ambient-beat-173058/).
I cut a short loop from that file and processed it a little in the game :)
A lot of the files I use were downloaded a long while before I find something to do with them, so I had to do some digging (for my next projects I am taking notes on assets used, so I can credit them more accurately).