No no no, the whole: "Hero" must defeat "Villian" to save/gain "Character/Reward" storyline is something that has been used hundreds of times over, you need to think of something different, outside the box!
Take my hack for example (that is, if you've heard of it.). My storyline is that Luigi is always tired of Mario getting all the credit for everything they do, so he runs away, and Mario then goes off to find him and apologize for how he treated him (different hack). Each level in ULW tells about Luigi's feelings and memories of the place you are in, and the farther you go in UMW, the more you learn of the history of the Mario world.
Also, you have to make up your own story, you can't just ask people to give one to you. The story of your hack is one of the main things people see interest in, just try your best to make one and you'll be fine
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