This application is without doubt, the BEST free alternative to Substance Designer. Still, there is a lot to do. I have been testing the software I would like to give a constructive feedback because it can be really huge one day.
Improve the camera control, there is no reason to rotate sideways the camera, it gets really confusing.
-Fix the bug on the graph panel that makes impossible to click in the rest of the interface after it happens
-The user interface is (no offense) ugly and the user feeling isn't good
-The zoom inside the graph isn't oriented to the cursor
-The sliding option over the values inside the nodes is a real mess
-It would be nice to incorporate some post processing effects and also a tessellates surface to test the materials.
-LAST thing (for now): FOR GOD'S SAKE PRESENT THIS PROJECT FOR AN EPIC MEGA-GRANT!!!! YOU DESERVE IT!! this is impressive although all the problems, got and take Epic's money. Keep it on, this project is on the right way.