Thank you matteo39 !
Serious Sam: First Encounter (G3D) – Original Game from 2001
-Download profile from the cloud
-make game settings first before using VorpX (game looses settings every once in a while, write protecting the settings file may help)
-turn up graphics to the max
-Profile is using cinema mode for better FOV
-you may as well use Full VR mode with Headtracking, but FOV need to be ini tweaked for that. This may help for any tweaks.
-known issues: some elements are 2D, Intro Screens look bad, blood at HUD depth. Pushing HUD depth more into the game may improve this.
-experiment with focal offset together with 3D strength if guns appear unpleasant for your eyes.