I use VorpX for a couple of years already successfully for many games.
If you are ready to configure and tweak you can make almost any game playable in VR.
Yes, at the beginning it seems complicated, but VorpX is a very complex software with a lot of features like button mapping between VR-controller, keyboard and xbox-controller, even ingame VR-buttons, etc., etc!
I read often that this software is crap, but i can asure you, that i do not want to miss it because it makes all my favorites and many more 2D games for me perfectly playable in 3D. Most of them in geometry-3D, all i tried so far (sure 50+ games) in z-buffer-3d.
The most important setting to turn off is liquid sync, which cuts framerate in half and inserts a fake interpolated frame. Which is fine to turn on if you have fps-stutter for some reason. But i so far never had a case where the experience was better when on. Maybe a feature good for low-end gfx-cards. I play with a 1080ti, and a i7-7700k, so i mostly hit my target of 50fps+ in 2560x1440 res geometry 3d. In z-3d i am always at 60fps.
The games i play right now are Fallout4 (looks amazing in g3d, i often just run around to enjoy the environment), The Witcher1 (tried also 2 and 3 but wanna finish them in sequence), Borderlands 1,2,3 in multiplayer with my Son (great fun), and many more just for fun to experience them in VR. Like yesterday the solus project. Did run it first in native VR for hours just to find out that it is - at least for me - more fun and playable in 2d with VorpX.
I am in no way affiliated with VorpX development. I am a honest fan of that piece of software because it let me experience so many great moments in VR!
Edit: i should add, that i prefer to play in cinema mode (a floating screen in front of me) with ambiant lights or dark, so that when i turn my head i see the rest of the screen right or left. So the distance to the virtual screen is pretty close (in menu around 0.5 and 0.7, depends on game), which makes me feel like i am inside the game. Then i do not need the „edge-peek“- feature (middle mouse button) for seeing the egdes of the screen. I just turn my head and see everything clearly...
I played for many years in 3d-vision, which is also a great 3d-experience. But since i use the 4k i really enjoy to play in VorpX-VR-3d - much better