In short: it's a very eerie game that you don't want to play alone in the dark but it definitely improves the atmosphere(you might say that this is true for every horror game, and that's true to some extent but this game just feels different).
Would I recommend it? For sure!
It's not that long, probably around 10 mins depending on how fast you are choosing "who looks more like a threat" so you can go and try it for yourself.
If you want to see somebody else playing it, here's my video.
Take care!