And my name goes right onto the list of all time highest scores ;)
I ended up beating every level and every single challenge. I must say though - level 9 is INSANE. I died 95 times trying to beat it initially. I just couldn't get the timing down for some reason, but after that shit I was determined to make a mark on this game, lol.
The game is pretty tasteful overall. The music is pleasant to listen to, and the levels are creative as well as the character in general. The drawings and animations look good in the game, and the mute option and high score tables work fine.
As far as things to improve on - the game is obviously lacking some medals. Not only for motivation, but as a nice achievement in your profile to say, "hey, I sucked it up and beat every single challenge in this game!" That would have certainly been nice.
The jumping at times seemed a bit awkward as well...sometimes it seemed like I was going for a jump, and somehow it just wouldn't quite let me and I'd just fall to my death :( So I think if you added the ability to jump anytime, and not only on platforms, that would make the game slightly more enjoyable.
The only other thing I could think of was the points in the game where you just had to kinda 'guess' where to fall so you don't die on the spikes. Elements like that in games usually don't appeal to me because there's just no possible way that we could know where to fall - so maybe a marker of some sort like a neon blinking arrow would have been nice on those levels.
Other than those minor things, I think you've put together an overall pleasant game to play, and I enjoyed it. Keep up the good work, and I hope you continue to make games like these an expand upon what you've already done. Be sure to send me a PM if you release a new version. I'd love to play and review it =)