Thanks @ramones for your feedback,
Guess what, your wishes will be executed. I've already added an option to mute the music. I'm currently trying to figure out a way of making the text more clear. Maybe different colors for words.
For the typing speed, I thought of that but, for me it was not very important for the game (the truth is: I don't know how to calculate the typing speed haa haa!). I could add that as an information when the player dies. I'll check on the Internet how to calculate that.
Anyway, your suggestions will be on the game tomorrow night at best ;). So, Stay tuned.