Hi Iambofdawn! Thanks for joining the DarkTober game jam!
Ok, so I would prefer if you wait until the game jam officially starts to start coding and making your final project; however, I don't mind if you start to code a prototype, create some concept art, or start writing a story. The genre doesn't matter, as long as the game looks appropriate for Halloween. It could be a top down shooter, adventure & action, puzzle. Whatever you see fit. My advice to you would be, before the theme is released (which will be one week before the jam starts) soak up as much inspiration as you can. Watch some Halloween movies, play some dark themed games. Pinterest and Tumblr are my favorite website/apps to get inspiration and references for my art. Then when the theme is released start to focus on creating a story and creating characters and such. The purpose of this game jam is to make a game with a good story rather than a game with super cool and complex mechanics. If you have anymore questions or if you're still confused, I'm more than happy to help you! :D
Thanks again for joining, and I wish you good luck!!!