Haven't actually bought it yet (haven't really been playing games too much for a while now), but mood and tone looks great. The dev's a massive retro game sci-fi geek and gun nut that takes inspiration from all over the place (noticeably BLAME). The sequel update logs look good too, with an increase in gun handling mechanics and gameplay variation. Heard the guy got harassed by people assuming it's a guro porn game, but that evidently hasn't slowed him down.
No gameplay screenshots? Sure, initial impressions of the hud and levels push people away, but the aesthetic's cool.
Beyond Citadel Dev logs: https://twitter.com/citadeldev?s=20
Seeing all those cycling gun states, manual bolt cycling and sprites gets me excited.