My friend is stuck at the roof and he is tweaking out!
And now for real - game is great. Atmosphere is quite "dense" if I could say for the whole playthrought. Sound design and general line of events can give you some hints on what to do next, what to find etc, but you can also get stuck easily - some additional hint (little bit of highlight of important stuff or maybe using light to show point of interest ) of what to do would be great.
Ah, also - if you quit and join again (after getting to elevator the second time) you can get stuck. It will spawn you without flashlight or any point of interest of "second level" but with a story of second level (cutscene with graffiti "one way")