I love what you've done. I see your multiplayer is on a lan with UDP. Would you mind looking into lobbylink ? Lobbylink uses webRTC to punch through firewalls and send both reliable and unreliable packets. It works with nearly every language on every platform. The server side is completely game-independent and feel free to use the same server I do for your game lobby if you want. If you need help getting started you can file an issue at https://github.com/danielrh/lobbylink or direct message me