Nice atmosphere, it triggered a little of my anxiety and a little of the fears.
I felt that the desk/coffee task was a little tedious, though I understand sending the message of: it is really tedious IRL :P
I have very little to say, besides that I did not understand the Metro at the beginning, and maybe having the 3D sprites/pictures rotate towards you would give even more atmosphere, walking towards one and noticing that it is flat and bends to follow some prospective, broke the spell.
Nice game :)