You should probably turn comments on or at least allow SOL Mail available for contact under your author name.
As far as my take, I found it a tough read because it is dense with explanations of backstory. As I'm not familiar with the game the story is based upon (but certainly with the character, albeit years removed), it really isn't my type of story.
That is part of the danger of doing fanfic. Many times it is better to create your stories with your own characters and plots to give readers a clean slate. Otherwise, you might get more feedback from an Batman: Arkham City game fan site (of course I may be wrong and simply turning on reader comments or providing a way of contacting you might give you what you want, lol).
Anyway, as I haven't finished it, I can't say more than it's not badly written thus far (at least as I've been able to read), just not my cup of tea.