You can double-jump from a ledge and reach the shaft. Then you can just climb the wall and get to the top without having to go through the challenge screens on the left. Here's a screenshot:
Because you can go back after getting the run powerup.
The joke I was referring was the idea of using an item at the wrong place. It was pretty funny, but it got a little repetitive when I got to the rubber duck screen.
Well, that's pretty much what the level revolves around. I made sure that no matter how badly you screw up you can still at least reach an ending.