Error: There's no twilight on the moon, because there's no* atmosphere to reflect sunlight. Maybe I'm being too pedantic adding the error tag for that? (But then, what is the error tag for if not being pedantic?) After all, David and Lucy don't seem to be having any trouble with the lack of oxygen either, and that probably wasn't an accident on the artist's part -- but I figure they're just built different.
*Technically, the moon does have an atmosphere, but it's extremely sparse and would not reflect enough light to create any kind of visible twilight effect, as far as I know.

Super_Affection said:

After all, David and Lucy don't seem to be having any trouble with the lack of oxygen either, and that probably wasn't an accident on the artist's part -- but I figure they're just built different.

If you watched Edgerunners, you'd know that David and Lucy aren't actually on the Moon, they were watching a special brain dance, a virtual reality movie through someone else's perspective, though in this case David and Lucy had free control of their actions instead of going through scripted actions of whoever's pov they're witnessing.