Drop your 4 Pets to the bottom to break their glass
Then work on getting enough of the correct colored blocks unmeshed (by making matches beside them)
You can clear them at any time by popping the balloon (as another balloon immediately drops), but as the charging of the butterflies works better if you make matches of the correct color in succession try to wait until you have at least 16.
Then pop the balloon, clear enough of the correct color and let those butterflies save the Pets.