I'm not sure if anyone has realised this yet but I was playing the other day and noticed a distinct similarity between this game and the classic 1998 FPS Half-Life by Valve, even down to the level names and layout in certain sections. It's probably just a coincidence but thought it was worth pointing out, anyway its a pretty good game - excellent really. I would highly recommend.

Edit: just finished game, having played HL1 a few years ago this is an incredibly faithful yet expansive and uplifting remake which just oozes quality and attention to detail. IT IS SO GOOD. PLAY IT AND THEN PLAY ALL THE HALF LIFES AGAIN AND THEN WANT MORE

Edit again: Idk why but I edited this again just to say BUY THIS GAME, SUPPORT THE DEVS, LISTEN TO THE OST (ITS INSANE), PLEAD VALVE FOR MORE HALF LIFE AND IF THAT FAILS ASK CROWBAR COLLECTIVE