I love my line-us :), but I gave the app 2 or 3 stars in the appstore because it’s really confusing when you use it the first time and everything feels mixed-up. I think the focus should be on the drawing screen because now it’s like jumping around and search for the functions. On the ipad it’s “okey” because you’ve the drawing area and the functions on the same screen.
So I’ve started to redesign it. Maybe this could help you to improve the app and is a little inspiration.
This is a link to the design file I work with:
Figma Design File (Left corner on the burger menu you can switch between different stages)
Click Dummie (you can start this by yourself when you click on the figma link and than in the upper right corner on the play button)
Wish you all the best in 2019