I am very glad you put a sensitivity slider. If I see a first/third person game and I can't change the sensitivity I'm not playing it for the sake of my wrist not exploding. It's a small feature but it matters a lot.
Something that frustrated me is that when I entered a building I randomly took damage. I don't think it was the electricity on the ground because I stood on it before and nothing happened.
I also found some numbers on a terminal, didn't know if they did anything or not.
Overall, I enjoyed it. Well done!