[rastapasta42]

No, this is not how you do a runtime.

Here's my Lisp interpreter in a couple of lines of Rust: https://github.com/rpasta42/LambdaOxide

And here's the accompanying graphics environment for my Lisp dialect (with a couple of mini-games as an example): https://github.com/rpasta42/skomakare

This is what I call "writing your own runtime"