I found this thing in quite a random way, literally ran into on itch. I haven't done much with it but I'll keep it handy. My current project isn't pixel art styled but I may do one in the future. This thing to me basically seems like Substance Designer but for pixel art. Some more nodes would make things better. I know people have made custom nodes too, which is good, but some of the basics are missing, like shapes/polys. It would also be nice to be able to put text to parameters instead of just numbers, so we know that shape 1 is a "pyramid."
It seems like you took some features from Substance Designer as inspiration...it just seems like the more the better you know.