The problem with creative coding and languages like Rust, or C++ for that matter, is that long compilation times break down the interactivity that is expected in such workflows.
Yes, I wanted to play with things like this, I love Rust, but nowadays I use things built in Python or Lua (like love2d) -- because I need fast interactivity for visual creative coding.
That problem is solved by the subsecond crate (an offspring of the Dioxus UI framework), demo here: https://youtu.be/Kl90J5RmPxY?t=1288
It's not integrated in Nannou specifically, but they're showing off Bevy and ratatui in that demo, both very popular frameworks in the Rust world. (In fact, Nannou is in the process of being rebuilt on top of Bevy.)