Very neat. Lots of similar tools listed on https://github.com/anderspitman/awesome-tunneling. Seems similar to zrok.io, ngrok, cloudflare tunnels, tailscale funnels and zrok although you're using http/3 explicitly.

Personally I work on two similar projects you might want to check out: zrok and OpenZiti. Similar projects, but zrok is closest to what you did here.