You have only one chance to complete the game. Don't make a single mistake during the completion. Pull the string and deliver the freak to the right place.
The purpose of this freak is not clear, but what is known for sure, is that he likes what he is doing. Pull the string and direct the freak to set the best trajectory of the launch. Release the button and watch him fly far away. Make sure he gets to the marked place, or the level will be considered as failed.