Thank you, I'm glad you found the concept compelling :)
Yeahhh we tried not to make the indicator of the lullaby too obvious, but since the baby was relentless and the mechanics were tricky, I think most players were more focused on being able to input the correct notes for ANY of the melodies without dying rather than figuring out the "puzzle".
Really enjoyed the concept of your game by the way, the art style was a treat.