i am curious to see what you did with smalltalk there.
you may also enjoy looking at pike, which evolved out of LPC, turning it into a general purpose programming language. it kept the ability to replace objects at runtime. which makes it one of my favorite programming languages, next to smalltalk. this ability to implement changes in a live running program is just magic. i find it actually disappointing how rare this feature is. it is pretty much the first thing i ask for any new programming language that someone designs.
It's slowly getting traction - Kotlin on Android has a "live update" feature (in development, only available in alpha release), for example. Multiple less mainstream languages also offer the feature. Nim got it in the last major release, for example. V has it as one of the base features. Erlang and Elixir had it since forever. Common Lisp as well. Racket and Clojure are a little more limited than CL, but also support it. Many interpreted languages offer some degree of this, either by default (JavaScript) or as a library/package (Python, Ruby).
In general, programming language features take about 20 to 30 years to go from obscure niche implementation into the mainstream. Look at lambdas - anonymous function literals - they're now everywhere, including Java and C++. Ten years ago, though, only some scripting languages had it. The feature itself is as old as the bones of the Earth (LISP, 1960, 63 years old). The same is true for many other "advanced" features. I think this is tied to generational changes - each generation of programmers has a chance to bring one or two lesser known features into mainstream, and then they're content with that. Other features have to wait for the next generation to discover them.
As for Smalltalk - I made a mistake and based the implementation on GNU Smalltalk, which is unmaintained. I should have gone with Smalltalk/X, Visual Works, or (begrudgingly) Pharo (or Cuis). I started the project as yet another attempt at making a MUD, but then changed focus to making a productive command-line-based programming env for Smalltalk. Then I changed my mind again and tried to make it into a usable shell. Here's the project: https://github.com/piotrklibert/stshell/ The screenshots focus on the REPL/shell side, but in the source you'll see things like "server", "player", and "world". There are a few locations IIRC and you can move your character between them still (plus, it's multiplayer, so another person can connect and you can talk to them!). It was an interesting project, but without a clear vision of what it should be it lost focus and I left it to rot after a while :(
you may also enjoy looking at pike, which evolved out of LPC, turning it into a general purpose programming language. it kept the ability to replace objects at runtime. which makes it one of my favorite programming languages, next to smalltalk. this ability to implement changes in a live running program is just magic. i find it actually disappointing how rare this feature is. it is pretty much the first thing i ask for any new programming language that someone designs.