It looks really good - spectacular graphics for a Unity game. It's essentially the same game though, except the map is randomized so you'll more often get lost and won't be able to memorize where to go.
I quite liked the original, it frightened me quite a bit (and kicked off sleepless nights as I immersed myself in Slenderman Media) but at this point the mechanics are a bit too familiar and the many, many terrible ripoff games have really devalued it. It gave me a few jumpscares but that's it.
Still, the beta is only a remake of the original and the full game will be an entirely new experience, so looking forward to it. Hope Parsec makes use of the mechanics he created for "Where Am I?" before Slender. That game was wonderfully subtle in being unsettling.