Hi Pilou!

Yes! Very cool and smart UI.
A very good start pointing to build a modern UX for an immersive device like the iPad Pro.
I've tried a little bit that App on my Pro and i like the idea of this UX for a digital painting app.
But I've also uninstalled the app after some minutes because actually, apart for the very smart idea behind its UI, actually it's a too coarse app. Nothing more than an experiment.

Clearly nothing near to super powerful apps like Procreate or Artstudio Pro.
Mile miles away from them...

But Borodante did A GREAT JOB when he thought to a UX like this.
Great idea!