I looked into this myself. Something changed, and I am not sure what it was, but apparently they use to work, and now they don’t. You have to compile the whole game again.
I understand where you are coming from because some of us are either color blind, or playing on windows, and from what I could tell, windows doesnt seem to display color very well, making things look the same (Houses and grocery store on map for example)
I am actually working on making the game have more visibility with ASCII though. So maybe check that out?
I definitely made the walls better to see (In my opinion) using an inverted graphic. And windows (IMO)