Quick question! As the Itch thumb/banner does not count against the limit and is completely separate from the game itself, I was wondering... is it allowed to make that image before jam start since it isn't part of the game itself?
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In general it's possible to create game pages, thumbnails or banners before the jam, provided they don't use any assets which are part of the final game (for example if the banners used detailed character designs, or the VN's logo, they would disqualify the future VN), and at the same time provided such allowed assets also don't deny the the player who only plays the plain game without this context a full experience. Creating a placeholder / draft page on itch before the jam can be seen as preparation, but putting in customization work, writing up synopses or character bios is in itself work on an auxiliary final asset and would go against the spirit of the jam, even more so if such created content were also published before the jam. In other words if at all possible, good etiquette would be to wait with preparing and publishing the itch page beyond a simple draft/placeholder until the VN is done or close to being done.