In order to get far in the game with the girl, you must be nice to her friends and only be mean to her ex-boyfriend Sean.
In the "Music" section of "Extras", the perimeters can change the mood of the music. If the perimeters are all low, the music will sound negative (eerie or scary). If the perimeters are at the center, the music will flow normally. If the perimeters are all high, the music will sound positive.