Cool game.
Was a bit apprehensive that it would need to know/understand ciphers, but thanksfully it was way easier than that.
The audio was really good, with some great work on the ambiant sound , even with the different styles.
The only thing that I didn't like was that there is no real point to listening to the tapes. I mean, the dialogues are funny, but once you understand that it's onyl about the hidden messages, you can fast forward through everything as a way to speed up and get any slowed down word, and rewinding when you hear something that seems reversed. So, it was a bit of a letdown, that what seems to be most of the work can be safely ignored.
But overall, really nice game, I liked playing it.