The music is from the incomparable Incomptech (Kevin MacLeod) and the sky images are by Jockum Skoglund from OpenGameArt (credits for both in %README.md). However considering how annoying it was to deal with setting up that skybox, it's nice to know it's appreciated! Thanks for trying the game!
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This is the second time I saw the name "Kevin Macleod", Sandpipers also has the music made by Kevin.
Mr. Macleod has long been an Internet fixture... I first found him because of his graph paper templates (yes seriously!) and later discovered his music, which encompasses a wide variety of styles with very generous (free) terms. I have also worked with musicians during one of my jam projects, but this one was just too chaotic -- I only got the music working until the very end.