When you start, you would see a metal block above your head, and yet another wooden box above that metal block, destroy that box to obtain the feather in which you need for Sue Zo.
As the key is in the top right part of the map, and the door is in the top left part of the map, it is easy to win this stage, and its too much of a hassle to teach you how to win this stage...
Just know where the octopee will drop and destroy boxes so that they will fall to the bottom. Remember to makes boxes in line horizontally with one another and destroying the boxes and making gaps for the octopee to land. Nuff said'