Hey, always worth checking the FAQ:
Does it have to be a single page?
For the jam, your submission should fit onto one single sheet of paper. The sheet could be a flat sheet or folded into a pamphlet. The game can be spread across both sides, but keep the core rules onto a single side. Use the 'back page' for ancillary info such as GM tools, solo-prompts, or extra gameable elements, such as a map.
Ask yourself the question “Can a group of players pick up the front page, read it through, then start playing the game without additional info?”. If the answer is yes, you’re in good shape.