I'm sharing a Godot project I've been working on that lets you run M.U.G.E.N games in the browser.
This project is built with Godot 3 and leverages Rust for native scripting. I kicked off this project a few years back as a personal project to get my hands dirty with Godot and Rust.
There is a demo hosted at: https://jefersondaniel.com/godot-mugen/mugen.html