I should've actually made the walls light-gray or something
Viewing post in Mirror Hall jam comments
Or maybe some parts of the ground could be more enlightened, for me the problem for example was on level 2, I could not see the ground, I just saw black everywhere on the lower part of my screen and did not see gaps. Or maybe have some kind of "leds on the ground" a bit like in cinemas ? I don't mind the room being very dark, but I mind not understanding where the ground is ^^