Our strategy for Mooncake Festival level 3-3 (formerly level 2-18) is to fire the first Black bird over the first tower until it lies over the helmet pig. The explosion should clear the right side of the level. Fire the next Black bird into the second floor of the left tower. If the explosion does not clear the level, use the final Black bird. The score in the video below is 127,090.
Note: In a recent update, the level numbers were changed from Level 2-18 to Level 3-3.