I agree with everyone else: great atmosphere (including the sound/music)!

I don't want to get into spoiler territory (sounds funny for a 10-minute game, but here we are) without having spoiler tags, but I do have one suggestion.  For a game this short I'm not bothered about it, but if you're going to develop what (to me, anyway) is the central innovation of your game in a larger story...you may want to take care that the player can't unknowingly cause a narrative sequence break.  Vague enough for you?  :)