Consistency is one of the best ways to get your users comfortable with your product. If they know what to expect from screen to screen it will cut down on confusion.
Candy Crush is consistent in its style. Sticking with a bright, playful tone that can be seen across the fonts, sound effects, animations, etc. Unfortunately, this playful style can be detrimental to clarity. For example one of the fonts they use is stylistic and can be hard to read. This doesn’t mean fancy fonts should never be used, but you need to consider where they would be