I really like this mod and have been coming back to it, but one thing that's bugged me is the lack of a "smooth transition" when changing biomes such as the fog and skybox along with your vision becoming worse the deeper you go being "instant" instead of it being slightly delayed (in terms of it creeping up on you until it rests; think of the old Void Fog in older minecraft versions.)
It would be an improvement if these visual quirks could be looked into, as I feel it would make the overall vibe of the dimension more eerie without breaking the immersion.