I finally gave this a good testing a few days ago! It's really looking good I have to say. I played my own mission (needed to look for bugs and mistakes anyway) and I can happily report that I had no real issues at all in VR. Performance was smooth as butter 90% of the time, no crashes or game breaking glitches spotted.
There were a few things, that you're probably already aware of, and are things that are most likely far down the line on your to do list:
-Many materials and particles draw completely differently in each eye which looks really odd, when you shut one eye at a time you see it clearly. Fire, water and shadows were the most prominent examples.
-The focus of the player is still bound to the mouse, and not the orientation of your head which makes frobbing really hard in many cases. (maybe adding a "crosshair" would be an acceptable solution for now).
-Related to the above having to use the mouse with freelook on to navigate around is incredibly nauseating, as it's tricking the brain into thinking the whole world is swinging on a pendulum as you look up and down. I consider myself pretty resistant to motion sickness, but that about put me over the edge.
Aside from these things honestly after getting some true roomscale and controller interactions, not being able to look under the hood, I would say it's a finished product, really great work!