One thing I really like in text adventures is when the game alludes to what could have happened if you had made a different choice. I picked the umbrella, and when I got to the park Sydney was cold and thought about how she should have put on her raincoat. I love little details like that.
For a narrative-based game, I didn't feel much of a story arc. I didn't feel much building of tension or payoff. However I understand that that would have probably been really hard to do in 48 hours, and to be fair I think the game makes up for it with its mysterious atmosphere.