It's been really cool watching the project evolve, it started out feeling like a cool kind of "oh yeah, I guess this is public domain now so you can do something like this" kind of vibe, and slowly it evolved and grew its own distinct identity. It's so much more interesting now than the initial concept trailers.
Ultimately as an FPS it will live and die by its gunplay, but as long as it's at least "good enough" I think the art direction and creativity will get it the rest of the way. Sort of the same as with Bioshock (which clearly was a big inspiration for the developers).