Moon struck will prevent candies matching the colour on the left side of the moon scale from spawning. If blue, red or purple colour appears on the left side of the moon scale, 12 additional candies of that colour have to be collected in addition to the 2 candies they have to collect six moves after the moon struck.
The orders are worth 21,000 points. Hence, an additional 9,000 points is required to earn one star.
This level will be made a lot harder if one of the colours you need to collect is on the left side of the moon scale at the beginning of the level. On mobile, you can close and reenter the level without losing a life to avoid this.