I enjoyed the game and found the story and characters well done. The historical element added a nice touch to the international conspiracy plotline. The art and animation were nicely done as well.
The puzzles were pretty easy for the most part. Only once did I feel stuck, and the historical analysis tasks presented no real challenge once you gather the data points. I feel like these could've required a little more thinking.
The game has a few bugs, but none that will ruin the game or prefent you from finishing it. One screen (I believe it was the house in Paris) is missing its background, so you have to hit the spacebar to see where everything is. Also, for the amount of research that went into the game, you would think they could find an actual French speaker to do the French-language text in the game instead of relying on Google Translate.