Very fun game and a very interesting take on the topic. You've nailed almost every aspect of the game, the WOWIE! factor especially ;)
There's only one thing that I would change in character control. When the player is on the wall, he could stick to it a little, so when I change the direction to jump from the wall I would have a little more time to press the jump button. But even without this, the character controls are really great and responsive :)