I liked the audio guidance you incorporated into the story. Really helped with immersion. I'd recommend adjusting how the audio loops when failing a task. For instance I kept hearing iPOD (I realized it was iPhone later) in the first part and wandering why 2003 wasn't working....THEN I had to hear the same audio loop again. In the event of a failure you could keep the player on the keypad and instead play something like "That isn't when the iPhone was created". Otherwise you're on to something. Keep at it!