The presence of four colours makes it easy to create special candies. However, it is not that useful till some of the blockers have been cleared.
The jellies are worth 148,000 points. Hence, an additional 192,000 points for two stars and an additional 292,000 points for three stars have to be earned through matching of candies.
There are plenty of frosting and liquorice locks which can be quite hard to clear at the start.
Once the frosting is cleared though, cascades should easily occur especially with four colours. In fact, the cascades will clear most of the remaining blockers.
The board is open with 74 spaces. Hence, it decreases the difficulty of creating of special candies.
28 moves are limited to earn a huge amount of points due to sugar crush and the limiting of the number of special candies created via regular matches. However, this point is less critical due to the ease of creating huge cascades.
Despite the above ratings, there are several methods of earning one star. They are: make matches at the top where possible, avoid creating huge cascades where possible, avoid creating colour bombs where possible and to use as many moves as possible. However, doing such thing is sometimes hard, sometimes easy.