Really flawed.
I love how on the jumping challenges, everything dissapears after a certain hieght. I mean, I could be gettin' so high, then I fall at least five feet and watch everything unspawn as I'm about to hit it. The other jumping challenges are annoying, too. Y'know, the ones with the mines and puddles? Yeah. I like how mines are spaced out one every 200 feet and a puddle every 2 feet. Thanks for that, really. Annoying progression, not enough unlockable things, and the things you can unlock are just weak.
Fix it, and I'll fix my score I'm giving it.