Hi I was part of the Feedback Quest. The VOD of the stream where I play this is up if you're interested.
To start, the game feels solidly built. It feels like a good functioning game. However as I mentioned in my stream, I had genuine motion sickness from playing it. Even some in the chat also had to turn away to avoid getting headaches. A good fix would be that the flashlight doesn't need to move as much, I understand the realistic touch but I think its not necessary for it.
Not sure if it was bugged but Slenderman definitely didn't feel like a threat. I feel that this game while solid, could use some work. I apologise I couldn't play deeper to enjoy the other stuff you may have included in the game, but the motion sickness I got from it was too much but still overall a good solid work.