Already exists. Sovereign Craft is a Bitcoin only Minecraft server with lightning address for every player as soon as they join, which can also be set up as your NIP-05.
And yes, we can zap each other in-game and we use sats to buy and sell items.
Discussion
Say wut!? You got a site you can link me to ??
sovereigncraft.com is the website. To join the server, just plug play.sovereigncraft.com in as the server address in your game. Works on Java natively and on Bedrock with some trickery I don't understand.
Https://sovereigncraft.com all details are there. We have lnaddresses upon join. Nip-05 coming soon