If coupon HYEHZ0-GNKD1A-GFNGMQ doesn't work, try coupon 20PERO-FFDIGI-GAMESX for 20% off dropping the price to $48.
Techland has made the "Play as Night Hunter" mode free for everyone due to the pleasant and nice feedback from the land of PC gamers. You now receive extra weapon dockets instead. Details here. This game is also a Steam Play title, which works on both PC and Linux platform.