Do make more colour bombs as it can help collect many candies. It is better if you can use it on a specific colour of candy, as it collects a bunch of them and may trigger cascades, which may indeed collect even more candies.
The most important aspect of passing this level is to aim for large cascades. Aim for a lot of "Divine!" combinations by clearing as many candies as possible, therefore allowing more new candies in play.
To increase the passing chance to roughly 60% or above, try clearing more than 300 candies within the given 25 moves.
Avoid having your board dried up of a colour, or it will be hard to deal with, even when you are short by a few candies.
The presence of five colours makes it easier to create special candies. However, this point is less critical because there are no blockers and the wide board.
The order is worth 15,000 points. Hence, an additional 65,000 points for two stars and an additional 85,000 points for three stars have to be earned through matching of candies.
Since there are no blockers, the amount of points earned from special candy combinations are not reduced. Even the colour bomb + striped candy combination can give a decent amount of points if there are a reasonable number of candies matching the colour of the striped candy.
The open board aids in the creation of special candies and cascades. This is useful due to the huge amount of cascades required to pass the level which in turn gives plenty of points.