Lua Carousel, the app for lightweight programming on computer or phone, now comes with comprehensive online help:
* A tutorial for programmers
* Exercises for learning programming
* Example programs you can run, clone and remix
* Reference documentation

akkartik.itch.io/carousel

Practicing graphical debugging using too many visualizations of the Hilbert curve

akkartik.name/debugUIs.html

You didn't ask me, but I've been building some text-first UIs atop a graphical canvas:

git.sr.ht/~akkartik/pe... (instead of left-lines of text that scroll down, each command from a palette appends a column of notes to the right)

git.sr.ht/~akkartik/dr... (unconstrained infinite 2D surface)