I very much enjoy the atmosphere. The lightning, the ominous footsteps...
I think the green keycard was a little hard to spot. Well, some of the interactable things in general are kind of hard to spot. Maybe make them stand out a bit more would help - like a glow or something. I could also see through some of the walls which was kind of weird, but the outline shadow when behind objects helped make sure I always knew where I was. Very helpful!
I couldn't figure out where to go after hitting the red button on the desk. Not sure if that was the end, but it's a good start to a project if so!