I had a bit of trouble with the sensitivity and FOV — both felt quite low for me, so maybe adding adjustable settings could help players with different preferences.
I was also a little confused about what to do after crossing the gate, as nothing seemed to happen. Some clearer objective guidance might improve the experience.
It would also be helpful to have a pause menu so players can pause or exit properly.
Overall, interesting concept — just needs a bit more clarity and polish.