First, choose Villains, then go to the corner outpost in the middle. Check all of them. Choose Jango or Boba Fett (It doesn't matter which one). Once your Jetpack is full, go into the corner and fly as high as you can. You should be able to walk on a bit of land in the air while shooting at enemies. If you have invincibility you can go beyond the walls of Mos Eisley and walk through buildings after you get over the main wall.