I always were wondering why someone would make a game this dark. I can understand that it is by intention because of reasons, but I personally even nearly would not have bought this game just because of its (imo bad) graphics.
So I modified the terrain with paint.net in a hour and came up with this. If you are the same opinion, you now have a chance of a very friendly looking Factorio.
Just download the rar and rename the old terrain folder for recovery reasons in the graphics directory of Factorio and extract the new terrain folder at it’s place…