Hint and you shall receive one
SPOILER
When you come down off the conveyor, put a box in front of that opening.
Put the 2 boxes into the small area with the square button, so that the top box is 1 space further to the east than the bottom one. That causes the UFO to go out. Be sure you leave room to get into the teleporter from the bottom.
Teleport into the next room. Move the deflector over to the right edge.
Stand in the top row on the left side...be ready to move up and right after the 3rd shot and shove the deflector down to keep the UFO from coming into the room thru the hole.
You will need 2 boxes thru the teleporter, 1 at a time. It doesn't matter which side you put them in, they will come out right.
O/G