I honestly never really got the Backrooms appeal, but decided to give this game a try. Honestly? I was ready to complain about it, but it's not really THAT bad.
It's really short but intuitive. There are clues as to how to complete it and the ending "puzzle" is really easy. But it's atmospheric. Not to the extent of really scaring you with its aura alone, but you can get a jumpscare or two if you REALLY want to explore the game. The constant noise (or almost lack of it) and the level itself are really charming, but it lacks replayability once ou complete it for the first time. Honestly? If the "scary entity" were to be more ruthless and more present, it would already help this game out a lot. Also, if the clues were better hidden, it would be even better. But honestly, for a quick/initial playthrough? It's quite alright, but you'll probably just try it once more to finish faster.
Now, i don't care about graphics, at all, but i ran this game on an i3 ASUS Laptop, with integrated graphics and 4gb RAM. On the lowest settings? It runs really well, so that is already a big thumbs up from me. Some graphic glitches here and there, but a smooth play none the less.
Overall? Try it once. Complete it. You'll feel compelled to complain about how short it is and how it isn't scary, but you'll end up seeing that this game has a lot of potential.
PS: To the Dev, don't bother with new levels. Perfect this one. Make it slightly harder, and make the final puzzle slightly harder. That alone will make this game appeal to a wider audience.