ok, without your website I wouldn't have figured out how to clear the canvas and while trying I only found out how to save the picture. I actually went back to the website to figure it out. Another thing i couldn't find is an eraser. If you screw up a tiny detail you have to start over. But I like the concept of quick ideas scribbled on anything you can get your hands on.
Thanks for your thoughts. I always thought a little effort to learn the interface upfront is worth it to keep it simple for the long term.
Yes sure, but it could be fixed if you added a few hints in the app.