What do you mean with copyright claim? Was the music in the gameplay footage flagged or did you added it on top? Anyways I wasn't aware that the music was fingerprinted. I looked it up and read that because it is shared by the pixabay license the usage in the game/video footage is absolutely fine. Pixabay suggests: clearing the claim and taking no further action.
Thanks for playing btw and the music you added works really well. Sorry for the inconvenience.