It’s a great App
I used is for first 10mins and I already liked it, and to understand it more I googled and youtubed it and understood how those tools work, it’s a best app for the people who doodle there ideas and can show it in 3D. Kudos to the feather team, also you need to come up with more brush options and if you can get a fill colour then it’s going to be groundbreaking Can’t wait to see more options in future. :)