Drop down the opening to the left and move the platform out of the way. Go back to the opening, jump, and hit
at the apex of your jump to survive. Hit
to flip the world again, then drop the box as far as it will go. Drop the second time field on the box, then hit
,
again to hit the brakes. The box will block the laser and let you slide to the door. You don't have to flip the world to enter the door either.