Some tricky platforming and challenging enemy set-ups give this level quite a bit of spice, with a major twist. Takes a bit of perseverance to get to the top, however I specifically designed it so that if you fall, you don't usually fall far, unless you freak out and start mashing the arrow keys (speaking from personal experience). There is also a green star that is shown at the end when you collect all of the ace coins.
Screenshot:
Woah that looks cool, I always like it when levels try and do something unique instead of just being another generic grass level. How long is it?
The level itself isn't actually really long physically, however personally it takes about 4 minutes for me to get to the top after practicing and testing a lot, getting a feel for it, etc.