Nifty idea, congrats on your first game (and I assume your first jam)! It might just be that I'm bad, but typing a wrong character felt *super* punishing: I'd lose a life for typing the wrong thing, and then again when the character I meant to type hit the bottom.
I'm guessing the music selection's random, but for a brief second it felt like keys were popping up in time with the jazzy track that was playing, and that felt really cool while it lasted.