I suggest making the review more complicated, i.e:
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-Rating accourding to different factors like eye candy, layout, mobility, etc...
-The option to claim the level for yourself, if someone posts a "nice tileset he\she found that he\she thought everyone should have, even though he\she doesn't know who made it", or if someone steals your tileset\level and takes all the credit for themselves.
-Multiple authur ratings: Averige rating goes to all the authors who made the level, and not just to the one who uploads it.