⏰ In A Nutshell
Please check if "Prevent App Uninstall" feature is enabled.
⏰ To Elaborate
If you cannot uninstall Alarmy, please move to [Settings tab > Alarm] and check if "Prevent App Uninstall' feature is enabled.
If it is enabled, disable this feature and then try uninstalling the app.
⏰ Keep This In Mind
! Wait a minute ! Why are you uninstalling the app though?
Please tell us if you have any problems via [Settings tab > Send Feedback]. We would be glad to hear your issues and help you out.