Nicely put together mate 
I haven’t loaded it up, yet. But will definitely be checking this out. I still use TheHandyApp and it’s great for what it does, one thing that is missing is short pauses in the stokes.
One thing I noticed about your app, and this may just be me. The animations are running in reverse. A script plays from left to right, the animations in your app run right to left. So when I connect the handy will the stroke follow the motion from right to left?