I’ve done some pretty deep comparisons of extension languages and my conclusion is still the same—differences in language implementation dwarf differences in language. You need a sandboxed extension language? That’s an implementation issue. You need to avoid dynamic libraries or run-time code generation? Implementation issue.
Show me a Unity3D app that runs on WebGL or iOS or Android, that compiles code at runtime. If you can link to a github repo so I can so how the code actually works, that would be even better. And I'd love to hear from the developer first-hand how they convinced Apple to bend their stringent app store rules just for them, but nobody else.