There's one piece of the fox statue in the thorny tunnel and all my attempts to get it up to where it needs to be seem to be hampered by one thing.
My keyboard, mainly. I can't press up + left + space all at the same time, which seems absolutely necessary to be able to bring the statue piece up to where I need to go. And I can't rebind the controls to get a button combo that doesn't work. I can only assume the statue is necessary for game completion as the other two I've completed thus far led to altars.