Is ruined by it's own difficulty
This is an excellently BUILT game, but it's infuriating as it could be actually fun if it weren't for uneccesary difficulty, now I'm not just bitching because it's too hard, I actually have gold on most levels.
List of game play mechanics that ruin the game:
You can't wall jump if you're not going above a certain speed
Running into walls at a certain speed knocks you down, this would be okay, if it wasn't so hard to turn around.
Ledge grab is quite random to whether or not you grab on, either that or very specific.
Fix these and it would be a 10