The first three birds are all Han Solo, so it's hard to clear the iron tower that block you.
Accuracy is very necessary for this level. If you make a little fault, you cannot pass this level.
This level is also depend on luck.
Send Han toward the first floating platform, aiming his laser off of the angled metallic slab on the extreme right, trying to detonate the TNT. Second Han should shoot out the chains above the main structure, and the third should aim for the top-right floating platform. All the while, try to blast the TNT in the middle of the level.