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Hey Mamiejo, you're doing great to be in the 800's! For this level the simplest approach is to destroy the icings on the right first, before you unlock the sugar chest on the left with the third key. Generate as many horizontal striped candies as possible and use them strategically on the multi-layer icing. Wrapped/striped combos are really useful here, just make sure you maximize their usefulness by having them take out as much icing as possible.
Check out this video of a player passing the level, it should give you some good pointers!
https://www.youtube.com/watch?v=3McNCsP2T1E
Let us know how you get on, and keep trying!