Smallest cross-platform language runtime?

For mostly command line tools, but ideally with some GUI support, what’s the smallest (and easiest to deploy) language runtime?

Rationale: I often write little tools, and often I need to run them in the future (frequently on different computers). I’d like to use C#, but getting a tool chain and development environment is a painful multi-gigabyte commitment. Today, I like Deno for its trivial deployment and smallish (80 MB) footprint (and VS Code+TypeScript is a great development environment, although not very small), but I’m not sure it will be around for the long term. Node is similar, but much more painful to setup.

Zig’s compiler (another smallish download) is intriguing, but it’s probably too low level when I only run the programs a few times a year (meaning I don’t want to write low level, fast code—-I’ll trade speed for ease of writing code or small footprint).

Tcl/Tk seems promising (I’ve heard it can be as small as a few megabytes). Any reason I shouldn’t use Tcl?

I’m sure there’s a Lisp option, but I haven’t found one with as small of a footprint as I thought should exist.