Hi there,
I am a music composer, I don't usually work for free or do game jams but I am impressed that you have a comprehensive game design document and a track record in game design so would be interested in working with you on your game jam project.
Here is a link to some of the music I have written for other games.
https://play.reelcrafter.com/gyQTH78pR2KxMtrqo6v8Cw
If you like what you hear then then send me a friend request on Discord: Iestyn#9278
Iestyn