I believe p5.js (used at https://editor.p5js.org/) is quite close to Scratch in spirit. Of course I think turning straight to javascript (the library really streamlines it) might be too difficult without instruction, so following some kind of tutorials or lessons would be necessary.

It's incredibly fun, and I've been making procedural... things for a while with it. Many artists use it (and of course every web tool is available... you can even later port the code to just straight canvas for the performance, although that's rarely necessary I guess).

See my little roguelike room generator: https://editor.p5js.org/gustavo.nramires/sketches/eyyxg7vl2

And a funky flower: https://editor.p5js.org/gustavo.nramires/sketches/hwhVUQu_X