Not playing it to win. Giving the game little rpg elements makes the games much more interesting.
How so? Even still, the situations that occur don't vary all that much. I don't mean to be critical, but I just don't see how you could RP this game. Most of what I hear about this game is that it is their absolute favorite game, they've played it through tens of times and have logged 400+ hours, or something of the like. This may be a slight exaggeration, but I just don't see how the game could hold someone's interest that long.
Note: I mean no offense in my criticism. If people are enjoying this game, then great. It is clean, polished, and for what it is, it works excellently, so I'm not saying that it is a bad game.