You did a great job building up that creepy atmosphere. Only downside is when you actually get a glimpse of the tall black guy. Maybe it's just personal preference but the fear of the unknown in horror games is too important and seeing the "monsters" early-on kind of killed that for me.
On the other hand, the use of the white masks did a pretty good job. There's even one place in the staircase to the basement where you can look through the wall and can only see a mask looking at you, with the white glowing eyes. Pretty good.
Other than that, pretty good game! Short and sweet just like I like them. Cheers!