There's some brilliant stuff out there. This game made a great counter to my Streets of Rage/Final Fight binge.
I really enjoyed "It Waits" and "Don't Eat the Mushroom". Perhaps not the best levels to play as early Knytt experiences, though.
This list is far from current, but if you trust ol' Auntie, she's collected levels that really show the amount of variety the game offers:
http://www.auntiepixelante.com/?p=439
Also, these posts by ortolson show off some great levels from the last few years (there are five of these posts, here's the oldest):
http://www.tigsource.com/2010/11/09/recent-good-knytt-stories/
I forgot how much I liked this game.

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