I think the sound is bugged on the submitted version as I played all the way through but there was no sound.
An interface comment; it's clearly designed for a tablet interface rather than a mouse; with the mouse, the game gets quite tedious, but would stay quite fun with the tablet trying to match the signature. Some scaling issues, particularly in full screen where the text would be barely visible in the bottom left of the screen, but is too small to read in the standard browser window for me.
Fun art and the different personalities of the rulers show up, both in the language of their letters and the elaborateness of their signature.