How do you beat level 14 on B-Cubed

Use the double-hit square (purple) to avoid "walking the plank" with a projecting square. Go up, then left, and down, and back across the purple in the middle. Go up and get the top right, then cross the purple again, go right, and left along the bottom.
The shorthand version is : U, L, D, L, D, R3, U2, R, D, R, D, L2, D, R2, D, L3, U, L