TL;DR
Show every piece of wall on the mini mapshow all walls on the mini map
I noticed that only every second tile of walls is displayed on the mini map.I would prefer if the algorythm for showing entities on the mini map would be more sensitive.
Now every second row is skipped and if a single wall or belt is in the skipped row it is invisible on the mini map.
This is especially notable in the beginning when you cant afford complex defense structures.