Hello! Thank you so much for playing, giving feedback and your kind words! So happy to hear that you're a fan of Project Gutenberg too. It's such a treasure trove, and I hope more people will take advantage of such an awesome resource.
I really like your difficulty setting idea. Do you think it would be enough to make the first few ciphers partially solved for each genre, or would it be better to let players choose their preferred difficulty via the settings menu or something like that?
Thanks again for playing!