What are the moments in Underrail that define the game from a visual and atmospheric point-of-view to you? Like something that you might see in your sleep after playing 18 hours of Underrail.
For me, it's the first entrance into Panacea Labs. It's an abandoned research lab in the middle of nowhere, only it would have been merely out-of-the-way, off a major transit corridor when it was built. Kind of a forgettable location before the fall.
And here you are. Very unassuming entrance. And of course there are mutant dogs patrolling just past the entryway. What amplifies this environment for me is the musical track, "Lab Report." Where it's playing a technological beat, as this was once a place of hope and high civilization, and has now degraded like everything else. So it becomes a mutant cleanup, but it wasn't always like this in Panacea Lab.
And you would only know about this place because of its ties to an ancient Biocorp experiment, otherwise you'd just enter as a scavenger like everyone else.
So it kind of exemplifies the environment of Underrail for me.
Other atmospheric moments are Dude's portal quest in general, and a number of places within the Deep Caverns. Like meeting those slug/snail creatures just hanging around amidst junk, hiding in bunkers to avoid the Eye, trying to get all the way to the bottom of the mutagen tanks and back up before being spotted, it's creepy along those walkways. And the introduction to DC itself, where you follow a path of genetically-modified fungus into an even weirder place beyond.
How about you? Like, if I had to draw a Fallout-style loading screen for Underrail, entering Panacea Labs would be one of them.