Here is an overview of the game, via its Steam page:

About

Gloomwood is a stealth horror first-person shooter that follows your mysterious abduction to a forgotten, twisted Victorian metropolis in the midst of a horrifying transformation. Wield your canesword and take to the shadows as you uncover the accursed mystery hidden within the fog.

The producers of DUSK, AMID EVIL, ULTRAKILL, and FAITH bring you a frightening, gothic immersive sim full of haunted streets, dark tunnels and decadent mansions.

Explore

• An intricate, hand-crafted city with freeform exploration—from towering rooftops down to hidden passages, the routes you take and paths you make, are your choice.
• A detailed stealth and sound system that tracks your light visibility and propagates noise accurately through the world. Tread lightly. Or prepare to get loud.

Scavenge

• A unique arsenal to meet any situation—a stealthy canesword, six-shot revolver, folding shotgun, hand-placed traps, rope-slinging harpoon rifle and more.
• In-depth player interactivity, from leaning to eavesdrop, peeking through door cracks, checking the bullets in your firearms and mantling onto ledges.

Survive

• A mob of ghastly denizens and monsters with acute senses, like the sharp-clawed Crowmen and the fearsome, cadaver-seeking Corpse Duster.
  Gloomwood is full of objects to pick up, throw, climb, smash and use to your advantage.
• There is more to this city than you can possibly imagine…

Watch the release date announcement trailer below.