This book (? game?) is awesome! I cannot stop reading. Absolutely gripping.
I do think the endnotes 30-32 are a little ambiguous. I'm not sure if you're supposed to write the deciphered text upon the cipher, or in a separate notebook. And I'm not sure if you're supposed to strike those endnotes if you solve the cipher. It looks like other people aren't having that issue, so maybe it's just me.
However, this hasn't impacted my enjoyment at all. Exemplary! Love this game. Play it if you can!