This was so cool. I was really not expecting it to be anything special, but I liked it :)
There was one problem:
There is a screen where you say "Gotcha" and I think that little enemy was supposed to kill me, but It didn't, I just got stuck there in the floor like if there was a sticy. If it was intentional, I really don't se the purpose of that.
Also while it is true that too few save points is bad, too many can also be anoying and take all the challenge away. If there are a lot of save points, the player doesn't really care if he dies or not, because there's little consequence to it.
Some good points in here! I think you are generally doing the community a service by making a level like this.
However, I have two counterpoints to make.
Firstly, not having the run powerup at the beginning is not a game breaker, and neither is jumping without one. I've played a good number of levels where you had to perform acrobatics without the run powerup, and I wasn't crying foul. The only real situation where not being able to run is a bother is if you then make the player walk across several featureless screens, or if you just leave them without the powerup for too long.
Secondly, remember this screen?
(http://fc09.deviantart.net/fs71/f/2011/341/3/8/knytt_thingy_by_blahson256-d4ifb2z.png)
I got past this challenge on my first try without even really trying, and I don't consider myself to be a professional at this game.
The secret is to climb up the side of the wall, reach the top without moving left or right, and then jumping to the next wall.
Just a minor point there, but do keep it in mind.
I will say though, that you raised some good concerns that are currently in a level that I am making. Perhaps I will need to gleam over my own level again and fix some of these problems.
First off:
Like Fubaka, I didn't really have any trouble with the impossible screen. I think the reason why it's fairly easy for us might be because that type of challenge has been showing up a lot in recent Knytt Stories levels. Or at least it feels that way; I don't have any exact numbers on me.
Overall I really enjoyed the level! I liked how you displayed bad design choices without really using them yourself. (If that makes any sense?) It results in an edifying and playable level.