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I feel similarly. This seems to be a common problem with a lot of the adventure games that get put up on steam and the like. They show off graphics and gameplay like a traditional game trailer but they never seem to tell you anything about the story beyond a basic synopsis. For me personally the gameplay is minor, and so long as it's aesthetically pleasing graphics aren't much of an issue either. Hell, I love visual novels where the only 'gameplay' is often an occasional decistion tree, although the choices often have significant impacts; and even completely linear visual novels as well.
What I liked adventure games was primarily the story and/or characters, and that sort of information is pretty sparse on steam, and demos seem rather uncommon as well so I never really know how well the story and characters are written within the game itself.

I think it's because these games are so content-driven: it's hard to isolate the story or characterization from playing the game itself. Maybe that's trickier to market. Neither of us are really interested in thinking a lot about marketing, so hopefully enough people will see something special in the premise and atmosphere and want to try the game out!

Well my comment wasn't really specifically targeted at this game since it seems as much driven by atmosphere as narrative, but a more general issue regarding how most of the adventure games I've seen on steam seem to be advertised.

It seems like instead of using the usual game style of trailer a trailer more like a film trailer could be more effective. One game on steam that I think does that well, although it probably had a bit more of a marketing budget to work with, and had voice acting, was "Chaos on Deponia."
Even as a sequel to a game I never heard of, just watching the trailer told me a lot more about the characters and narrative and what sort of writing and humor to expect than most adventure game trailers do. Thus making me much more interested in both the original and the sequel.
Of course it's also probably a good bit easier to do that kind of thing with a more comedic storyline.
In general though if narrative focused adventure games did their advertising/trailers in a more movie trailer style, it would probably grab more people who may not be the old school fans of the genre who can look back to older games and know exactly what your talking about when it comes to storytelling style and characters and comparing to say, Monkey Island or other adventure games from that era.

Hopefully there will be a demo for this game when it is released though the setting and themes from what is available now does seem interesting. Best of luck to you on the game.

You might also want to check out the original trailer from the Kickstarter (showing very different graphics and gameplay) to get more of a feel for the setting ,concept, and storytelling.

This game is all about what you see in the trailer, it's visual and audio style, and about things you'd not want to put in a trailer like what characters say or don't say to eachother and how things progress.

This game doesn't have the fail states that most classic adventure games have, and feels very open ended for it. Even though it's obviously not some open world adventure game in the sense of 'proper' open world games... that would be weird.

also this game is weird.

The atmosphere and aesthetics was enough to draw me in. I want to learn about the world and people that inhabit it. I'm glad that the trailer leaves the game as a big mystery. I hate that before I see a movie, 99% of the time I already know all the big plot points and theme from the trailer alone.

http://www.giantbomb.com/quick-look-kentucky-route-zero/17-6940/

This video shows about 30 minutes of gameplay, though if you're a purist and don't like to have anything spoiled at all, this video might not be the best option. Watch at your own risk. All I can say is that this video convinced me to buy it as soon as it is released on Steam. Looks very, very interesting.

I really like the trailer, it actually convinced me to buy the game right away.