The key to beating Level 14 is to remember that anything you can land on with a hard impact -- if even for only a moment -- could allow you to die, if it's from a high enough height. I'll let you get to the bottom of that mystery.
PS: I really enjoyed the game. It's hard as you get farther along, but I'll honestly say it's always fair. There are no dirty tricks that violate the physics or the rules of the game.