This game looks fun, do you see yourself adding a PC point at any point? I would really like to play this.
Oh, that's more complicated. I have a development version of the game that is playable with keyboard+mouse but it mimics some VR behaviour with a quite convoluted controlling scheme (to extend arms, etc) + there's no controls for some of the things you may do.
To make a keyboard+mouse (or just non-VR version in general) it would require a bit more work. The most important things:
1. Weapon management. Instead of the current "main weapon on forearm" I imagine it would require slot approach to switch between 4 weapons/items?
2. Simple/short version: Add "use" button. Long version: redesign how interaction with various devices looks like - instead of pulling levers/pressing buttons, some would just require pressing button to use, while others would require telling exactly what you want to do. I imagine that entering various utility rooms would just switch to a different control scheme - instead of walking in the room you would be selecting which device to use and how.
3. Redesign some parts of the game. Some of the sequences are quite hard to play on keyboard+mouse while they're much simpler in VR. Centipede fight is among them. Without impossible spaces, it would be possible to completely change how specific sections play. Instead of being limited to a small part of the world, ie. platform, you could walk freely.
In general, it is doable and it might be a good idea to do this. It needs to wait a bit though. Till the game is released as a VR title.