I finished the game last night, and truthfully...
It's the best game of its genre i have played in many many years.
I just loved the exploration elements, mixed with the upgrades and all the options of choice. I'm replaying it again on the hardest setting for the Pacifist run and Doctorate.
My first run i did mostly pacifist, but killed a lot of people in the beggining of the game, despite choosing the non-lethal weapon. But i managed the game with a stungun, tranq gun, and an overpowered, fully upgraded pistol.
It was fun.