Nice job Karpoonz, a 3D game like this in a week is awesome! The atmosphere is really nice and the idea of using the lamp posts to parkour your way to the key is a really smart idea (even if I missed it).
I encountered a few bugs: One where I fell through the floor after loading in (I think the game was confused as to whether I was still in the menu or started the game?), one where I got stuck on the plank or wall when dropping down after the treadmill, the full screen option didn't work for me, and the quit button also didn't work for me. Nothing too crazy.
Some design notes I thought of when playing were that it was really easy for me to get turned around and lost. I'm pretty bad with directions, both in game and out so this might be more my personal issue, but I think the fog being a close color to the building made it more difficult (also potentially the narrow FOV). My suggestions would be to either make the fog a dark fog, or make the building a different color that stands out more (unless your intention was to make it more difficult to navigate).
Otherwise I really enjoyed the graphics. As someone who is very slowly getting into 3D stuff, I was really impressed with what you put together. Some atmospheric sound would be nice, like maybe rustling leaves or wind, but otherwise fantastic job!