I think my first thought about 2-3 minutes into this game is 'when does it end?' and then I had a duh doy moment remembering it's called 'Endless Void'.
It's super eerie, and the music accompanying it is really what delivers the whole atmosphere, which is the best part of it.
But walking down a corridor, and there being nothing but walking down a corridor, with no end, the eeriness wears off and the thing becomes dull after the 'oh, its JUST this'.
If there was something to strive for, if there was a goal insight, a reason to compel us to keep walking besides experiencing eeriness and just plain curiosity, then it could be something really cool. But at the moment it feels a bit like a tech demo?