Thanks for letting me know! Looks like there was a change to a library I was using. I've removed the validation on the peerId, so you should be able to play now. Apparently this game has been unplayable since 3/19/21 haha.
Don't get your hopes up too much, I made the game in a week for a game jam haha. Regardless, hope you enjoy it and thanks again for letting me know it was broken.