Overall I really like the GTbee app but it has not been updated in two years. Some things I wish were added:
Not having the ability to delete a goal. As it seems to easy to delete a goal. Actually created a goal to keep me on track in this regard (https://www.beeminder.com/linux535/nogtbeedelete)
Instead of setting a countdown let me set a specific date.
Allow tags to be added to tasks and custom reminders.
Again like the app currently just wish it was updated.