Knytt Stories is a 2D platformer game made by a guy known as Nifflas. The standard level is about a young girl named Juni who must to turn off a machine that was built to infest the world with evil creatures. There is an alternate ending to that level too. The game itself even comes with a level editor, where you can create your own stories! It's really cool, and you can get it right at the link below.
http://nifflas.ni2.se/index.php?main=02Knytt_StoriesYou can also put the levels that you made up for download. If you do have levels, post the link to the download here, on this topic!
Mine is currently unfinished, and I don't think it will be finished until 2009.
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OMFG WTF GTFO STFU FU!