Here is his website including video (http://polybrush.org/)
His YouTube channel here (https://www.youtube.com/channel/UCRWIYUwhzHaUEJ27Vq3Gx-g)
I downloaded the app and gave it a try, it's a very cool tool.
Highly recommend it to anyone to give it a quick try.
It's very easy to produce some sophisticated forms in there very quickly, ideal to get something to trigger imagination, good for rapid concept designing/sketching/form finding,. Also produces some very weird organic looking shapes very quickly (with the remesh function)useful to sculpt on in 3D sculpting programs afterwards or make new brush with it.
This reminds me of (http://al.chemy.org/) but in 3D form.
It's a bit buggy in its current form but it functions well enough to get the picture.
Most prominent and immediate bug for me was problems with support for my wacom tabled.
Monitor mapping did not work (I have 3 monitor setup) pen moves along all monitors instead of only the middle one (fiddling around in the tablet driver/mapping does not solve the problem). Also the pen pressure stops responding after a while.
The normal's on the 3D models seem to occasionally flip when adding next paint strokes in combination with grid rotation. I would also recommend an aligning/snap to camera function for the drawing grid, preferably in combination with 3D mouse support for more ease of use.
I use my 3D space mouse in combination with drawing tablet all the time, having to switch to navigating the 3D scene with keys feels like a heavy handicap.
Also maybe a bit of a feature request for me would be to have the paint strokes converted automatically to optimized bezier curves that can be edited afterwards. Would be even nicer if the paint stroke instances (objects on the curve) could also be edited afterwards (things like its scale and rotations etc., maybe even replace instance would still be possible).
I would love to see this app in some kind of semi generative form, where most things of the paint stroke are parametric and remain so after it is applied. Maybe have options to add multiple objects in one stroke that randomly scatter/get selected/applied.
All in all it looks very promising and a real must have tool for every artist.
Impressive work for a one person project.