It's tricky to kill all pigs with only one bird that is the key for three stars.
Target score is quite high. You can miss three stars even with one bird.
Strategy
Send Han through the first Mynock and toward the black TNT. Try to hold off on shooting Han's laser for as long as possible, the goal being to shoot both TNT and the swing on the right side of the level. So long as the right tower topples. Getting high score is the most difficult part.