Maybe he went back in time, killed the guy who caused world war 2, causing Hitler to raise to power and cause and even worse World War 2, and fell into depression. His only escape was painting about the video games he used to play as a child.
Not just the painting itself but body anatomy and mechanics (albeit frozen in one snapshot) and such also resemble computer games, wow this is some seriously trippy shit.
I'm assuming this was done with heavy use of masking, possibly airbrush, and maybe other painting media? It "feels" like a collage, where every subject is just its own painting kind of composited into the whole. But that gives us completely subjective lighting to work with, which throws our senses for a loop. Just like how old computer graphics are collages of other discrete artworks, again, with no effort wasted on coherent lighting or shadows.