One of the best of these kinds of indie 2D platformers. Love the way levels continuously build on new mechanics and slowly get you to the point of doing some pretty intense platforming, especially on the b-sides. I really like the mechanics involved in climbing/grabbing onto walls and the way it combines with the double jumps to really make some super tough but creative and fun levels. The story, while not really my thing, eventually earns its metaphor, especially in how it ties into the gameplay.