If you've actually studied cryptography, I can understand why this game was easy for you :)
After all, even though the general difficulty is above avarage, it's still made so that most people who want to try will be able to play and eventually beat it :p
I've always liked "outside of the box" elements in games, if they aren't all too vague. As a musician, I obviously wanted the game to have a great atmosphere too :D
As for the "cries of truth" level, I get where you're coming from. However, there is a way to tell where the message strats. But I don't want to spoil things in the review section!
I can only imagine how difficult it must've been to discern these messages quickly back in the day!
It's nice that you appreciate the secret ending. I admit that it's quite vague, and doesn't have much of a connection to how the other puzzles are build. Of course, that is also intentional, since I don't want it to distract from the story. It's more of an easter egg, really :)
Thank you for playing, and for writing an encouraging review!