Personally -- and this is a hard decision to make -- I'd say that Typhon Pact: Plagues of Night
was the best of 2012. I loved the way it slowly, slowly wracked up the tension until releasing it all with the final battle -- it feels like everything's suddenly spinning out of control, and then its final, shocking sentence is the dark finale. I just loved it.
Honorable mention to Typhon Pact: Raise the Dawn
, Cold Equations: Silent Weapons
, Vanguard: Storming Heaven
, and Typhon Pact: Brinkmanship