All movement directions relate to the character on the left-hand screen.
In a couple of sections you will need to walk into things on the left-hand side of the screen, while your character on the right continues to move unobstructed.
Up
Right x 2.
Up x 6 to the collectible.
Left x 2
Down x 4
Right x 2
Up x 3
Left x 4
Right x 2
Hold Up until both characters reach the exit.