To me, story and emotion are very important. I always felt that when you watch a film, what you love isn't so much what you see, it's what you feel.
For me it's the same thing in a game. When you play a game it shouldn't matter so much which button you are supposed to press, it should be about what the game makes you feel.
I try to make the player feel things they don't normally associate with video games, like feeling sad or uncomfortable.
I try to explore these grey emotions, there is no black and white, it's not about laughing or crying, it's about all the different shades of grey in between.
For me, a game should be an emotional journey. You want ups and you want downs and what is interesting is what you feel between the two, that's what I'm really looking for.