The point of your first launch is to clear out the house in the front. Simply aim directly at the house.
Power Activation Point
Activate your jedi sword as you are about to hit the house. You want to flatten this house as much as possible.
First Shot Result
The first shot clears and flattens the house. You will then have a clear path for your follow up second shot.
Aim and launch into the cave. The goal is to get a clear shot for your lasers to bounce off the metal surfaces.
Second Power Activation Point
Activate your lasers whenever you can get a clear shot. You want to angle the shots correctly too so that they can trigger the bomb.
Second Shot Result
The bombs explode, destroying everything and all the pigs in this stage. The three star rating is then yours to keep.