During my university courses at University of London, we made a side-scrolling video game, a sound visualizer, as well as a MS Paint clone using P5. It's definitely accessible for beginning JavaScript programmers.
Surprisingly, if you keep the feature set down, time to ship wasn't bad. The project was done in about half a semester and that's only working on it here and there. For the final project we had to implement three "advanced" drawing tools, I think one of the ones I came up with was to draw Bezier curves, now that wasn't exactly trivial and could definitely add some time to ship.
Depends on how feature complete you want it to be.
Back when I was working in Processing a lot, I could probably have whipped up something decent in an easy weekend. If I wanted to have more complicated features like flood fill, cutting/moving regions etc, I might need an extra day to figure it out.
If all you want is a bare minimum scribbling lines in a limited palette, that could probably be done in a matter of minutes.
I made extensive use of P5.js during my time at University of London. We designed a side-scrolling video game in the Intro to Programming courses using this library. It was really easy to work with and is a great library for those looking to get their hands dirty with some JavaScript.
Thanks, it's something I've always thought on doing and the motivation finally materialized. It's niche enough that I haven't had to do any advertising and the viewers keep coming so that's been great!
If they're on Windows, the built-in Quick Assist tool (Ctrl + Windows Key + Q) is a simple way to connect without having them install any other remote access tool.
