Now when I have nearly completed a level I get a pop-up that says I will get a reward after failing a few times.
I have only received the UFO from this feature once in the last three weeks that it has been available. It seems okay as a feature, but as it only pops up when you scrape through a level you can't keep track of your progress. As I haven't seen it that often I can't make my mind up if it only works the first time you fail a level.