They ring even if the app is killed, the phone is locked, or it's on silent. A full-screen "incoming call"-style ring, not a notification that you won't notice.
Office day, Work From Home, Sick Day, Café etc. Build each one once, then just pick "today is a ___ day" instead of recreating alarms every morning.
Woke up late? Rough night? Push your entire remaining timetable forward or backward by however long you need; today only, or permanently going forward.
Feel free to suggest some features to us