Was it just the amount of combat that you didn't like in
SIGNALIS?
The atmosphere of that game for me is so strong, I'm a bit surprised if that didn't at least hit some of the vibes you're looking for.
Seeing that you've played
D and
Enemy Zero, is it safe to assume you also played
D2 (Dreamcast)?
Lunacy/Torico (Saturn) is also worth checking out, in that same vein.
The earlier
Penumbra titles and
SOMA from the creators of the
Amnesia series also have some pretty oppressive atmospheres, with little to no standard combat.