This would be my go-to doodle app, but the image vanishes inexplicably after using three or four levels of spirals. Makes no difference if I use auto draw or manual. I did eek out one more spiral when I changed the speed of autodraw to fast instead of normal. That trick only worked once. Worth noting - the image does return after hitting the undo button, so at least the image isn't lost. I simply can't add to it.
Another issue, the app support link goes to the developer sales page. I can be understanding about providing feedback for a buggy drawing app that offers this range of features with such a clean interface, but to send support issues to a hype page shows me the developers might not be all that serious about making this product work properly. Bad service. Fix those issues, and I'll add more stars.