joveian: I see the same issue in Beat Cop although not as strongly.
Really, the only thing that lets Beat Cop's perspective appear kinda strange, is the "flatness" of it all.
But if you divide the picture in its three main segements
(street, sidewalk and back alley), it's still visually apparent, that all takes place on the same plane
(apart from the little curbside between street and sidewalk).
And that's exactly the flaw with "Plague: London 1665"'s perspective:
visually, there are at least three
(maybe even four) different planes
(A + B + C [+ maybe D]), where there should be only two
(A + [B+C+D combined]).
Of course, I get, what the dev, respectively their artist wanted to do
(have a street on plane B, a sidewalk on plane C and the background on plane D)...but because they drew plane B in
//// direction and plane C in
=== direction, they make our brains think, plane C is a wall, sitting on plane B.
If they had simply drawn plane C also in
//// direction
(while keeping the lighter color for the cobblestones), it would have been apparent immediately, that plane C is supposed to be a sidewalk, running along the street
(= plane B).
Btw: it also doesn't help, that all the lamp posts' ends are "lined up" along the upper rim of plane C.
Might have helped
(at least a little) already, if they would have been longer
(stood over the upper rim of plane C into plane D).
Alas...it is now at it is...and can't be changed anymore.
But that nobody noticed this during development...
sigh