The thing that really struck me when I played a demo of Gloom of Kilforth about 18 months ago was just how great it was at providing just enough detail to fire your imagination and fill in the blanks to tell a unique and interesting story and the final version of the game is no different. The use of keywords and the bits of flavour text on the cards means that if you are of a creative bent, you can really flesh out an awesome tale. The massive amount t of cards means that no two games will ever tell the same story. I am really looking forward to telling my tales and reading other's stories of how their heroes overcame (or not) the gloom.
This is what really sets it apart, from say, Runebound.