Now that was a REAL tough challenge, but it felt good to complete in the end. Definitely saved the hardest level for last there, and it really felt like the culmination of all the different movement strategies that were needed. Great job! From my experience (windows version), the audio needed some balancing/tweaking, especially the jump sound that played the first frame of the audio on loop while the PC was in the air. I personally am less of a fan of ice-physics type controls where you carry some of your horizontal momentum like Meat Boy, but I understand that it's a preference thing with challenge platformers and you should never try to hit every person's tastes. Overall it's a solid concept and I'd love to see it fleshed out!