No, you dont have to animate if you don't want to or are unable to. Concept sketches are just as important in the beginning stages as the final artwork.

And as Radium said, we cannot use anything that directly relates to Jazz Jackrabbit. For example, we cannot use the same planets, weapons, goodies, baddies, etc.

However, if users wanted to make tilesets or whatever on their own, they could do whatever they wanted. We won't be able to distribute copyrighted items without permission, though.

-Onag