This.
The narrator is *really* good. Actually the whole sound design and special effects are really good.
You get immersed and feel the visceral effects of the things happening on the screen much more than they are simply because of the very good sound work.
However, this can only fool you for so long. I've clocked in over 500 hours in DD, and I honestly can't say I'm proud - after a while you learn the sounds, and lines, by heart and eventually you shut them off due to their repetitiveness. You put your favourite music in the background - and when that happens, the illusion is gone.
I like lovecraftian-themed games, and I want(ed) to like this game, but eventually it all falls apart.
For those that want to look into the narrator: his name is
Wayne June. Twitter account:
https://twitter.com/wayne_june