Games like DarkVein: The Outbreak
Games like DarkVein: The Outbreak include Resident Evil 4, Hades, Ori and the Will of the Wisps, Devil May Cry 5, and Resident Evil 3. We matched them by the tags players give DarkVein: The Outbreak on Steam (Downloadable Content): closest matches first, and among equally close ones the better-known games.

Resident Evil 4
Shared: Single-player · Action · Steam Achievements

Hades
Shared: Single-player · Steam Achievements · Indie

Ori and the Will of the Wisps
Shared: Single-player · Steam Achievements · HDR available

Devil May Cry 5
Shared: Single-player · Action · Steam Achievements

Resident Evil 3
Shared: Single-player · Action · Steam Achievements

Hotline Miami
Shared: Single-player · Steam Achievements · Action

MONSTER HUNTER RISE
Shared: Single-player · Action · Steam Achievements

Resident Evil Requiem
Shared: Single-player · Steam Achievements · HDR available

Resident Evil Village
Shared: Single-player · Steam Achievements · HDR available

Resident Evil 2
Shared: Single-player · Steam Achievements · HDR available

Black Myth: Wukong
Shared: Single-player · Steam Achievements · Action

Feed and Grow: Fish
Shared: Single-player · Steam Achievements · Family Sharing

Hollow Knight
Shared: Single-player · Steam Achievements · Family Sharing

Dragon's Dogma 2
Shared: Single-player · Steam Achievements · HDR available

The Binding of Isaac: Rebirth
Shared: Single-player · Steam Achievements · Indie

Vampire Survivors
Shared: Single-player · Steam Achievements · Family Sharing

Hades II
Shared: Single-player · Action · Steam Achievements

Katana ZERO
Shared: Single-player · Action · Steam Achievements

KovaaK's
Shared: Single-player · Action · Steam Achievements

Bright Memory: Infinite
Shared: Single-player · Action · Steam Achievements

My Friend Pedro
Shared: Single-player · Action · Indie

Resident Evil 7 Biohazard
Shared: Single-player · Steam Achievements · HDR available

ARK: Survival Evolved
Shared: Single-player · Steam Achievements · Family Sharing

S.T.A.L.K.E.R. 2: Heart of Chornobyl - Standard Edition
Shared: Single-player · Steam Achievements · HDR available