Looked into the environment using the Rift, I take it the textures are 2k textures? Just some minor gripes, but nothing huge 
By any , do the materials include roughness? They seems a bit, smooth, to me.
The demo scene used a “way to bright” directional light in the part were it opens, if it were me, I would have dimmed it a bit and added light rays to the scene (with the dust particles, it would have fit). I would have also liked to see an avatar / feet so I could check out the collision meshes.