Try "VREnabler.zip" from this site.
https://www.notion.so/beastsaber/How-To-Force-Any-Unity-Game-to-Run-In-Native-VR-Mode-cf8c50f66f2740d5b692db786a8386a1
With this mod the Game works perfectly fine in full VR. I went through the entire game from start to finish sitting on a chair and using a gamepad. In VR Kristallijn is an exceptional experience.