How do I progress to chapter 6?

To progress to the next chapter, you must complete the Adventure Scene (point-and-click adventure in the 6th scene in each chapter) and have enough flowers to open the next level. The number of flowers needed is indicated next to flower icon on the top right of your main island screen. If the items in your storage are not enough to meet your flower needs, you'll need to acquire more flowers in one of these ways: buy decoration, renovate landmark, upgrade 3x3 building, or get from Jack's delivery. If you buy decoration, the flowers will not count until after construction is complete and the red ribbon is removed.