I love the visual design, and the bulk of the gameplay, while simple, was engaging and tied into the story well.
However, the decoding segment does not work as well for me. First of all, it's significantly harder than anything before or after it. Second of all, the "hints" are for things I never in a million years could have possibly guessed on my own. And finally, because decoding language is so dependent on being able to guess what certain words are, even minor typos like "researches" (the plural of "research" is just "research") can completely break the puzzle.
Overall I love the concept, and the visuals really tie everything together. Great job!