Thanks for the feedback!
I adjusted the password input; it now prompts the player to press 'Enter' so the game will acknowledge that it was submitted. I had worried that this wasn't clear initially, but hopefully this will help moving forward!
On the music, I had intended to implement audio for the entire game, but I ran out of time. I worry that adding the audio to the rest of the game would be considered a feature update, so I likely won't make that change during the voting window.