I can imagine that, at the time, this sort of interactive/live visual environment was revolutionary. The rest of it is "interesting" I suppose. The bit towards the end (around 5 min mark I believe) where he gives the IDE (is that what you call it?) an input + output and asks it what message would produce the result he wants is pretty damn cool. I watched the whole video, thank you for sharing!
#Runjs code
Show HN: Sunflower Editor – like adding console.log to every line of your code. You need to manually trigger "cells", which return a single value/visualization, or add a bunch of print statements. Notebooks are also a worse experience for the same reason. Using an actual REPL sucks compared to being able to regularly edit a file in your editor and get all of this + more without being handicapped to a terminal buffer. This allows me to use an entire file as a visual REPL with instant feedback. In VS Code, I can use extensions to show realtime values next to every line of my program, and indicators of whether a branch/code path was ever hit. This is fine if you live in an age before graphical editors, but today we have tools with a better REPL-like experience. In a REPL, you're given a buffer to enter text into, and it evaluates it as you submit this buffer. I hear this amazement and fascination with REPL's that people have and I don't understand. Any developer tools/subscriptions/packages that are worth buying paid/pro plan?. Without you having to go to an external context like a debug window to see the bindings. Effectively animating the flow of data through your code. In fact, since a program is about binding values to the symbols in your code, when running your code, the IDE, enabled by the content-addressable code feature), could replace variables in the text with their bound values, successively. The REPL-driven development approach should ideally afford simply changing code in the code editor, detecting the change, and showing the result then and there, without you having to go to back-and-forth to a separate REPL-shell and copy-pasting / retyping code. But with the ability to see the content of the data structures within your IDE. Especially good for debugging: getting the exact program state from loading up an image of it that someone sent you. Some have described this as REPL-driven-development, or interactive-programming. But without being a whole isolated universe in its own right like a VM or an isolated image. 
So the language should make such visualization and code-augmentation easy for tooling to support.
It shouldn't be necessary for the programmer to take the effort to visualize it in his mind (with the error-proneness that entails).
Since "An algorithm has to be seen to be believed", as D.E. Also, it should be possible to visualise/animate an algorithm. Ideally with example data, not only the data type. Structure he/she is working on, at any given time, in the code. Programmer should always be able to see the data No need to manipulate data structures in the human mind.
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