There's no verification. This isn't like Global Game Jam where we want a zip of all assets/scripts involved. The only thing you need to submit is the itch page with your game on it.
Cheating is rare in this jam because it's generally someone submitting their game to every jam they can find like a shotgun blast and, simply put, those submissions always fail our most basic requirements and are easy to weed out.
Additionally, there's no prizes- so no one who genuinely wants to take part is really incentivised to cheat as there's no reward.
Sounds like you and your team are really energised for the jam though, I hope you all have fun!