Hello! There are two themes: MIRACLE and A DIFFERENT CLASSIC. You are free to choose one of them, mix the two of them, or make a game that doesn't involve these themes at all. They are not mandatory, they are only creativity helpers ;)
I also strongly suggest you join our Discord server so that the organizers can answer any further questions you might have faster ;)
Link to the Discord server: https://discord.gg/ZXKtQJ7