I have some old music I think could fit your game. If your game engine doesn't accept midi just use a random midi to mp3/wav website.
https://drive.google.com/file/d/1K-G2Fw2XpRBUMY_ou3uzVS1hVP19MFLL/view?usp=shari...
I don't have anything I particularly want in return. You don't even have to credit me.