Yes, Barnacles are a threat in VR. They don’t kill you instantly. You'll deal with them in familiar ways, but the opportunities afforded by VR also give you new methods to use against them. We experimented with moving the player, but moving the player without their input in VR didn't work very well. As with many aspects of working on this game, we’ve had to find new ways to take well-worn mechanics and other Half-Life staples into the specific framework of VR.
Similarly, Combine soldiers definitely return, both in the form you’ve previously seen them as well as with new variations to keep players busy and take advantage of VR.
Some creatures respond to audio more than others. We don’t want to spoil anything, but there’s an example of this we’re particularly excited about.
As with audio, limb dismemberment is not a factor in most combat encounters—but there is a very notable exception.
Because the game includes the ability to mantle in continuous motion, you don’t need often need to jump. For instance, if you need to get past an obstacle like a crate, you mantle up rather than jump up. The only time you need to jump is to traverse a short gap, which happens very rarely. We tried a few iterations of jumping, but ultimately found that even in continuous motion, players preferred dealing with those jumps with a teleport-style movement.