As mentioned before, there is not a theme in the classical game jam sense. But there will be something you should try to integrate in your game. An additional challenge so to say. And this thing to include in your game is *drums*

Your Opinion on Pineapple on Pizza

Have it as a comment, as an easter egg, in the end credits, as a sound file, textmesh, sprite, etc... just let the player know, how you feel about pineapple on pizza.

With that out of the way: Ready! Set! GO!