I encountered a couple of issues wile playing this:
- The sniper did not fire at all
- The footstep sounds didn't trigger on some surfaces, I mostly noticed this when going onto or off of slopes.
- In some areas the walls are seethrough from one side, and I was able to shoot enemies through them, without triggering them.
- At one point I fell through the world. I think it was pretty close to the end so it might be the same one the other commenter mentioned.