For "an experiment created by a novice developer for educational purposes." with a warning I shouldn't "expect a polished product." This was quite good!
The part where the lights all turn off was actually very well done, as I was siking myself out constantly turning my flashlight on and off trying not to attract this "menacing monster". Also, when I first heard the noises of it's foot steps I lost my mind and started running the other direction and turned to hide in a corner for a couple seconds with my flashlight turned off!
But, I may as well say one thing I don't like much about this game. I don't like the room's generation. It's fine for what is is, but it mostly feels like a random assortment of walls rather than a place with rooms and or corridors. But I'm okay enough with how it is now.
I'd give Backrooms: Abandoned Reality a:
8.5/10 - Spooky scary!