First, try to stay near the corners. The red poles are able to be turned around if you hug the pole and press space. Next, when you reach the choice between left and right, turn left. Use the Grappling Hook, but swing to land on the platform on the right. Keep going until you get to the final room. Jump with the 1st curb and swing with the Grappling Hook to the platform (if you have Grappling Hook+ reel it in a little before jumping), then go to the end.