Oooh ! That's procedurally generated. It makes it much more interresting. Is it the same seed every game ? Does the explored path remain, or is it erased ?
A yes, deadlines... Decisions have to be made.
As for Memoire Eternelle, I believe that Rature used Inkscape to draw outlines out of photographies. Then he exported them. That's a style he uses a lot in his games. (We were 2 : Rature and me)