Get ready for some heavy criticism, I got a lot to say.
First of all, the audio. The sound effects were very random, loud and they suddenly cut off, you could have added a fade in and out to them so they feel smoother, the main menu could use some SFX for the buttons and some music as well and during gameplay you should have added some ambient noise, that way it adds more to the atmosphere and gives the player an uncomfortable feeling, some footsteps for the player would have been rly good so the player has some audio feedback when is walking, also there are some heavy footsteps when going down the stairs that seem to be activated by a collider, that's very odd since if I stop moving the sound still plays and i can go back and reactivate it, it feels very out of place.
Now lets get to the visuals, at first the quit button from the menu doesn't highlight like the play button does, the title text could look more interesting by changing the font or other text effects, when I started the game all I saw is black, I tough the game was loading or something until I actually move the mouse and see the light behind me, you could have added more lights to the rail tracks zone or make the player face the way he has to go from the start, there was also some weird black fading when I went to the sides of the tracks which feel completely unnecessary, same when the lights turned off and got the flashlight, on the first hallway there were so many lights the framerate was dropping, you should have used baked lighting instead of so many point lights to save performance, some of the walls seemed like they were colliding in some areas and the model was glitching, a lot of the models were clearly from the asset store so I wont complain about the level design style inconsistencies, I understand that 3D modeling is hard.
The game could also used some options for volume and sensitivity at least because for me the game was really loud and the mouse sensitivity pretty high, other settings could be for resolution, fullscreen toggle, vsync and other graphical stuff but for a game this short is not exactly required.
Ok I shat on your game long enough lol, time for some stuff I liked, fist of all the concept for the game is rly nice since well...it made me click your page, the chase sequence felt good, tough a cool this u could have added is the ghost starting to get closer and closer to you but since is your fist game ill cut you some slack.
You will definitely improve as time goes on and if you keep working. Good luck.