To pass this level, you must collect 40 blue, 30 orange and 20 purple candies and score at least 9,000 points in 40 moves or fewer.
If you have extra moves left in this level, Sugar Crush will activate striped candies and score you additional points.
Simply match the desired candy colors.
Don't focus on clearing the icing. It will take care of itself.
6 colours usually make it hard to create special candies. However, the board is open, so there shouldn't be any problems with creating special candies and cascades.