The next Half-Life game is a VR exclusive. That means you’re going to need a pretty expensive hardware setup beyond your existing gaming PC to enjoy it. If you’re holding out hope for a non-VR version of Half-Life: Alyx, Valve’s got some bad news: this is a game that straight-up would not work with a mouse and keyboard.
“We would love to be delivering a version of this that you could play with a mouse and a keyboard,” Valve’s Dario Casali says. “But as we said, it began as an exploration of VR. The more we used the controllers and the headset, the amount of possibilities these things give us, the more we realized that there’s so much opportunity that we can’t really translate back to the keyboard.”
With your head, hands, and feet measured in 3D space, “all simultaneously tracking and moving, you just can’t really get that with a mouse and keyboard. And when you put that into game mechanics, the kinds of interactions that we can do now we couldn’t possibly do with a mouse and keyboard. Like interacting with doors is one of the most obvious things.
Original source: https://www.pcgamesn.com/half-life-alyx/no-vr