This is probably not a fair review but I'm aiming for a neccesary one. Kono yo no owari e no tabi's story can be summed as a repeating dream (hence the surrealism) of an apathetic man. Nothing else. It's not one of those weird and kinda interesting dreams we all have every now and then, but one of those you have when you went to bed late and you gotta wake up early to go to work: not good, a bit boring, almost wishing you could just wake up already, go to work and be over with it so you can go to bed earlier thenext day and maybe then have a decent dream.
If this is your first time reading the Nishioka kyoudai then you'll think the art style is interesting but it's actually pretty lazy considering other works.
Overall, this manga is a looks over substance kind of story, don't let the "deep" themes fool you (because they're just there, in the surface and nothing else), and even then the "looks" part is not the best this duo could offer.
If you were looking for entertainment, don't read this. If you're just into the aesthetics and surrealism, hit it.