Rust really has a great support for WASM. I made a tiny language as well, and managed to build targeting WASM in a few steps https://github.com/calcit-lang/wasi-calcit/blob/main/.github... .

Tips to notice is WASM runs inside a sandbox, which means threads, random numbers generator(not sure for WASI), FFIs, etc. have to be moved out of the core to prevent them being compiled to WASM, which would probably fail. For major part of the code, they can be compiled to WASM and WASI(WASM System Interface) very easily.