Games like Marine Hearts
Games like Marine Hearts include SUPERHOT, KovaaK's, Call of Duty®, Neon White, and Half-Life 2. We matched them by the tags players give Marine Hearts on Steam (Underwater, Time Manipulation, Action, FPS, and 3D Platformer): closest matches first, and among equally close ones the better-known games.

SUPERHOT
Shared: Action · Time Manipulation · FPS

KovaaK's
Shared: Action · FPS · Shooter

Call of Duty®
Shared: FPS · Action · Shooter

Neon White
Shared: FPS · 3D Platformer · Action

Half-Life 2
Shared: Action · FPS · Singleplayer

Battlefield™ 2042
Shared: FPS · Shooter · Action

Battlefield™ 6
Shared: FPS · Action · Shooter

BioShock Infinite
Shared: Action · FPS · Shooter

Aimlabs
Shared: FPS · Action · Shooter

Titanfall® 2
Shared: FPS · Shooter · Action

Black Mesa
Shared: FPS · Action · Shooter

Bright Memory: Infinite
Shared: Action · FPS · Shooter

Battlefield 4™
Shared: FPS · Shooter · Action

DEATHLOOP
Shared: Action · FPS · Shooter

Ready or Not
Shared: FPS · Shooter · Singleplayer

Ravenfield
Shared: FPS · Shooter · Action

Call of Duty®: Modern Warfare® 2 (2009)
Shared: Action · FPS · Shooter

Battlefield™ 1
Shared: FPS · Action · Singleplayer

DOOM
Shared: FPS · Action · Shooter

Halo Infinite
Shared: FPS · Action · Shooter

Call of Duty® 4: Modern Warfare® (2007)
Shared: Action · FPS · Shooter

Call of Duty®: Black Ops III
Shared: FPS · Action · Shooter

Call of Duty®: Modern Warfare®
Shared: Action · FPS · Singleplayer

BioShock® 2
Shared: Action · FPS · Singleplayer