2018-06-21 Updated text in the accessibility service used on ancient Android versions to ensure this app is compliant with Google Play policies, and disabled it completely on non-ancient devices. This update also contains some changes to ensure the app works on the latest Android versions.Heads-up Notifications 1.13 Update
PS: Even though I said I won't update the app anymore, the "simple light" theme just got Android Oreo styling. 😉