Clear bubbles from one side, then find a gap where there are only leaves to send either a bubble or Nero's orb.
Work with the shape of the bubbles pattern.
Look for places in the game you can send the beam from Nero's orb up through the leaves and create a long pathway for the ghost, (following where it is done in the video can help)
Always aim for the highest bubbles in the game and don't be tempted to make matches where they are not useful for moving the ghost up.