App is useful, you finish one level, you move on to the next, making mind training a kind of challenge.
However, there are no real settings, the App writes Mindfulness data to Healthkit, but doesn't read it back, a shockingly common problem with Apps in this category, even the most popular ones. No way to contact the developer via the App, presumably this is possible via the developer page.
Hopefully some of this will be addressed in a coming update.