Never thought of Borges' tales as "noir" and your introduction had my whole attention. I really liked the structure of roles (Personas) and characters.
I think that character creation could be more refined (maybe asking each other questions instead of filling blank spaces); I'd like to had some examples of motives.
I really liked the creative use of Memories and the the second iteration of the game (I think that changing Personas is the most interesting versione, while changing just the characters results in just another iteration of the game).