The game has many flaws, but I am still learning Python and Pygame. You can jump from the top; the issue is that when you jump there, an internal timer prevents another jump. Its duration is a normal jump landing on the ground. So if you land on the wall, there is a small delay before you can jump again. The jump cooldown should be reset when you land on the ground or a wall. Thanks for the feedback, and added to the list of fixes needed.