Laser from laser blaster gun on the left side is extremely annoying.
There are a lot of pesky pigs.
Rebel birds don't help you much because they are too weak to through the iron blocks.
Getting 3 stars is extremely hard without upgrades or power-ups.
Send rebel pilot towards the two pigs on the two high towers after TIE moves to the left. Splitting the rebel before impact. This may cause destroy most pigs. Use another rebel birds if necessary, but make sure you damage the structure enough.