I've noticed a minor problem. The features of this app aren't something I need all the time, so I sometimes turn it off (using the slider at the top of the settings page) to save battery. But even though the slider is off, the app sometimes continues to operate. Some more details:
When I set the slider to off, the settings page disappears, and I see only the graphic of the orange and yellow background with the blue curved line between them. And the app seems to be off. But if I go back into the app later, the settings screen will be displayed again, even though the slider is off. And edge-lighting notifications from apps I selected will appear again. This seems to happen when I reboot the phone. I'm not sure if that's the only time.
Not a major issue, but it would be nice if turning the app off actually kept it off.