There is an essential part of the jam that I do not understand. How will everything come together? Will an image be posted and we draw sprites that will go on top of it or do we draw from absolutely nothing and we make up the decor with our sprites? Second option seems unreasonable but you never talked about this in the page.

Everyone will draw objects/props/people/bits of the scene and I'll put them together. So at first it will be like the second option: there's mostly nothing to go off of.

However, I'll periodically post the in-progress scene image on my own submission page (I'll provide a few hours after the jam starts, when I start to put together sprites). So as the jam progresses, the scene will become more defined (and it will tend towards the first option you talked about). This is why I want people to submit their sprites as soon as possible :)

Thanks for asking about this. Maybe it's a point I should clarify, as it is soo important to the jam.