Super nice project! I also spent the last month writing a WASM interpreter ( https://github.com/rrampage/wart ) using Java 21. I started it as an excuse to try out the pattern matching in switch / sealed classes in Java. It kind of snowballed in scope and can now run Doom and Waforth ( https://github.com/remko/waforth )! Have not yet tried compiling it to WASM and running it as a meta-circular interpreter.