IMO that death wheel is an atrocious bit of design. The controls on the outer rim, trying to jump the electric fences and up the steps without sliding off, make it a hideously painful experience. I triued countless times, with much anger and frustration, before I beat it myself. Played it coop last night which only makes things harder, and wasn't even close after 4/5 attempts. I have no idea how I completed it the first time. I think I had a lucky slide off the top and landed on a ledge.
I have got far better with the controls, finding again my retro counter-movement skills, making tiny adjustments mid-flight, but that's beyond many casual-/non-gamers skills or patience, and right on the threashold of me having fun versus getting annoyed at the game being too punishing.
All in all I find too many of the platforming aspects awkward beyond fun, in many user created levels I've played as well as the official ones. Aceing the subway level is a hideous pain in the butt. The second set of spinning wheels are unpredictable and it's way too easy to die. I shouldn't have to play a level 30 times to find the secret, or get the fluke! There should be a clear path with a reasonable margin of error. I'm sure some gamers are proud of their 733t skillz and prefer levels no-one but they can do, but you're not going to his mainstream appeal to pandering to that niche!
Lack of coop creation is also annoying, but at least the creation side is going well at the moment. Lots of inventions and pieces as I work towards my first level, and I'm not encountering showstopping bugs. Rewind is working well now, as is detach, and the creation process is fun to learn and experiment in, and very rewarding.