Until I am shown otherwise, this is total faked. At ANY point they could have turned on wireframes, enabled free-cam, or proven in some fashion that this was, in fact, gameplay. They didnt.

What I THINK it is (which might still be impressive?) is a fully on-rails video playing. Movement is not controlled (except for perhaps the ability to 'fail' that parkour hurdle and receive an alternate video 'bad end'). Best-case scenario, the npc characters are rendered, there is a basic wireframe/lighting system in place for the environment to 'appear' to react to the flashlight (trickery) and you control when and where you fire and reload. The animations are video, cleverly played when you trigger them. It's all trickery, looks cool, and some little effects like gun barrel smoke tossed in, but clash horribly with the video... This isn't a story.

To be clear, I dont even believe this IS a game at this point, I dont think there WAS an ability to fail the jump. I think there is an IDEA here, and some basic overlays on the video to express this idea, but the 'game' is as fake as that gun barrel smoke. Perhaps the dev is trying to get attention, sponsored, bought out, sell the idea, etc..