Progress with g4js - a new GUI library for p5.js

I know that there is another discussion about this library but its focus on compatibility and development tools. In this discussion I am interested in your thoughts about the API and functionality (e.g. controls available etc).

The library works equally well with both P2D and WEBGL and this demo shows it working with a 3D sketch (a p5.js example).

### g4js progress demonstration ###

Any ideas for additions or improvement are welcome :grin: