What a creative little game! Reminds me of the likes of Narbacular Drop and Tag: The Power of Paint.
I loved the whole game from the visuals, to the sweet melody (which is actually really catchy :D), the progression, the different music boxes and their functions, and the small additions like the text animations, the options and the fact that you even added a language option. Wow!
The only complaint I can think of is that I wish it was 'E' or a button closer to WASD to get the next text at the bottom instead of 'Enter' but that's a really minor issue.
Great work! :)