I get short in time because my job sucks and I got tons of overtime, so for now I can probably submit only a docx with no cool graphics. I read that the bundle is in October so, it's fine if I do a WIP submission and refine it in September?

The bundle will be running in September, but a WIP should be fine :3  A good way to advertise it is that customers get early access with the final version ready for the spooky season.