Does it work without VR? (Psychonauts in the Rhombus of Ruin)

Sorry, but no. This game currently requires either the Oculus Rift, or HTC Vive headset in order to be played. More recent generations of headsets may be backwards compatible, but the game was designed and tested on these. Attempting to start the game without a VR headset will produce a warning/error message that will block your progress.