sorry to hear that; alas this is a budget game and it is optimized for small cheap notebooks so the game logic framerate lock is not to change
however the full version has a letter boxed mode to give more fov (but I think the update was made after the easter demo)
of course there is also a console command to change the vertical fov (but imho that deforms everything)
strangely so far I was under the impression it was the high FPS that was giving people motion sickness 🤔