Taking inspiration from a real historical event is a clever idea, and you recreated it well! But strictly speaking, it feels more like an interactive historical reenactment than a standalone game. Players who know this history beforehand already know the right call, completely bypassing the tension of deduction. Plus, relying solely on mind games without other mechanics gets a bit dry after a while.
Just a suggestion: you could use this setting as inspiration, but randomize the data and add more gameplay mechanics to fill in the gaps. That would give it so much more depth and great replayability!
Since this is your first Game Jam, props to you for taking on such a challenging concept! It's definitely tough to pull off. That said, your art and audio are completely spot-on! I know you'll do awesome next time!