@avibryant I don't like Squeak or Pharo either.
ST80 is an amazing program, maybe someday I make something like it on Uxn. I think message passing schemes are pretty cool to play with computers in fun ways.
The ST80 VM is total madness tho, I've recently read "Bits of History, Words of Advice" and it's a nightmare in terms of portability.
While I enjoy noodling in ST from time to time, it's just not how I enjoy programming personally, but I could see myself building a similar sandbox.
@avibryant immediate drawing to the screen, self discoverability, structural editing. It's all great ideas. If I was a programming teacher, perhaps I'd use something like ST to show logic in real time and explain procedural graphics.
Uxn is just a CPU, most of the programs that I've built on it are of a much smaller scale, I'm not smart enough with these things to put together something like ST, but I think I can draw inspiration from it and bring some things over.