It would be nice if the app would prompt you when:
- you're about to breach your goal (like - "hm... this is the last sticker you got. One more and the goal will be breached")
- when you're about to reach your goal ("Only one sticker left and you will reach the goal!)
- when you're half way there for the positive goal ("You're half way there!")
It would be nice if the app would prompt you when: