Great idea.
I enjoy how you don't need to worry about anything except for hitting the proper letters. The only problem though is when you hit shift out of a natural habit of typing and have to restart because you "got it wrong." Asides from that it makes you feel like a really fast typist at times, and sometimes makes you feel pathetic about the little mistakes that you end up making throughout game-play.
~MadenameXD/Spiralz