Just seeing this now. I made a multiplayer game in Godot for the jam.
The connections are peer to peer with one player hosting. You still need a server though for a lobby and to negotiate the peer to peer connections around NAT.
I used the webrtc components for that with the reference server from the official examples. They have a server implementation in gdscript and node.js. Should be easy enough to port to anything else though.
Edit:
Just uploaded there and read the docs. Seems like they provide connections and lobbies with the MultiplayerENet components. Sounds pretty great and would have saved a lot of nerves in my case. But I guess all players would have to play on gotm.io and it wouldn't be possible to connect to the native versions or itch.io