Thanks! If I had more time I'd expand the area (right now it's 1 km^2) and with that reduce the fog amount. I didn't want to reveal too much to the player, and the fact you can't see much adds some level of scariness to the game. The game does however reduce the fog when you're close to a POI.
I really wanted to add some big enemy on the borders of the map (ghost leviathan definitely came to mind), but went with less time-consuming way to keep the player in. And you found it scary so it does the job hahah.