Using the UUVR mod (Universal Unity VR), by Raicuparta, you can activate the Unity VR camera and play this game in Steam VR! Of course, it uses keyboard/mouse or controller like normal (no VR controllers), and there's a few technical tricks since it is not made for VR. Ready? Go!!

Step 1) Run the game at least once,

Step 2) Install 'Rai Pal' latest version, https://raicuparta.com/rai-pal

Step 3) Using 'Rai Pal', find this unity game in the list of your installed games, and install:
__a) Config Manager Mono
__b) UUVR Mono Modern

Step 4) In Steam, run the game, and then exit from the main menu. (This will install the UUVR config file needed for the next step)

Step 5) Back in 'Rai Pal', click this game, find the mod 'UUVR Mono Modern' you installed in step 3, click the 3 dots on the far right, and click 'Mod Settings' to open the config files folder:
__a) Double click the config file 'raicuparta.uuvr-modern.cfg' to open in any text editor

(Phew! Almost done!)

Step 6) Edit these settings in the config file 'raicuparta.uuvr-modern.cfg':
__a) Camera Tracking Mode = RelativeMatrix
__b) Align To Horizon = true
__c) Use SetStereoView for Relative Camera = true
__d) UI Patch Mode = CanvasRedirect
__e) Preferred UI Plane Render Mode = OverlayCamera

Step 7) Connect your VR headset to your PC using your preferred method (Steam Link, Oculus Air Link, Oculus Link cable, Virtual Desktop, etc...), press the 'Start Game' button in 'Rai Pal', and after a bit the game will start in your headset!

**Make sure to click the game window so it's in focus on your monitor.

This setup worked for me using a Meta Quest 3 with link cable, and Nvidia 4080 Super.

Not even the devs know that this is how the game was really meant to be played!
Have fun!!