I think the next time you do it, you should give at least a month warning to when it will begin. In this time before the contest officially begins, people would be able to plan and think of ideas.
Then with a week to go before the start date, people may start to build up a collection of tiles and sprites in the tileset they are using (or create a custom tileset). They will also be able to put all their scripts in it, and make custom items etc. But strictly NO screen creation.
Of course this would all have to be based on an honesty system. But I'm sure all us PureZC'ers can be truthful enough.
I believe that you should be able to use any tileset, and not be marked down for using more 'popular' sets.
The size of the quest can differ, with unlimited overworlds, but a maximum of four dungeons, including the final dungeon. This does not include small exploration caves and such obviously.

