I'm not sure how much more you can do with this concept, but it's first entry I've tried where I can't think of anything to criticize. The parts where I had trouble were only because I didn't expect the mugs to be in actually reasonable places.
Viewing post in Mr. Coffee's Deconstruction jam comments
One of our concerns was to make it sure that the mugs were within reason and avoided situation that could prove too problematic for players. If the game is featured and we can futher develop it we plan to up the actual challenge of the game and tune it accordingly so later levels become far more skill demanding without being overly frustrating.