I know about the playlist, I just wish the player could guess the code based on the context in-game, so it would be more like a puzzle. I know that might be difficult though since people will phrase things differently.
Also, I noticed he reacts if you text "I love you"! He acts a little surprised. And if you write "Kill me" he shakes his head and refuses. I really like those details!
Really loved this game, if you ever release a longer version I will buy it!