Different color of wall lines,

On some maps its hard to see walling lines when they r same color as ground

I have that problem too. Thought ti was just my colorblindness always making it harder to see walls.

More contrast might work, but changing the colors wont solve anything. because what happens when you want to wall in enemy territory and the color of your wall is the same as the color of the player?

Just make them black or white

Yes, it can be difficult to see the lines with some colours, agreed. Stronger colour/rendering differentials will be suggested.

Stop blind.

What about a faint black border around the wall line. If there was the border you'd see it and you could keep the colors as is.