First try to break the icing. Do not worry about making wrapped candies at the beginning. Make sure every move you make hits a layer or two. Striped candies can help a lot too.
Once the board clears up a bit, try to make a colour bomb as soon as possible. Blow up the colour that has the most candies, not necessary being yellow. This allows you to make combinations more easily, and wrapped candies and colour bombs can be accidentally formed at this point. If you can, try to make three or four colour bombs to use it on yellow, as they will not make you lose the level any more.
Mystery candies can help you complete your orders or lead you to your demise.
This level unofficially introduces the UFO for Reality (Dreamworld has it at level 417 and officially introduced in level 846) and UFO on marmalade for Reality (Dreamworld has it at level 417 and officially introduced in level 850) on web version.
That is a 427-level difference! You are less than halfway through!