This game is AWESOME!!! I love word games and I love rhythm games so this really did it for me. It's a very cool idea, and I love that you scraped Project Gutenburg for this.
As a couple others have mentioned, I did end up spamming q and z which was a pretty viable strategy until I got too ahead of myself. I wonder if this game could work where, like, you can only use each letter once, or like playing a letter puts it on "cooldown" for a few rounds.
Such a rad idea and a really cool interpretation of the theme