There is no cheat code for Run 2 Level 14. The browser/Flash game (by Player 03 / Kongregate) has no built-in cheat system, and external trainers don't exist for specific levels.
Level 14 ("The Long Haul" / long corridor with alternating gravity flips) tests momentum control.
The satisfaction of nailing a precision platformer level cleanly is the whole point. Keep practicing—you'll get it.