Games like Regain Earth: First Strike
Games like Regain Earth: First Strike include HELLDIVERS™ 2, Risk of Rain 2, Left 4 Dead 2, How to Fish, and PUBG: BATTLEGROUNDS. We matched them by the tags players give Regain Earth: First Strike on Steam (Roguelite, Shooter, Cartoony, PvE, and Indie): closest matches first, and among equally close ones the better-known games.

HELLDIVERS™ 2
Shared: PvE · Shooter · Co-op

Risk of Rain 2
Shared: Roguelite · Co-op · Shooter

Left 4 Dead 2
Shared: Shooter · Co-op · Zombies

How to Fish
Shared: Shooter · Co-op · Indie

PUBG: BATTLEGROUNDS
Shared: Shooter · Survival · Multiplayer

Back 4 Blood
Shared: Shooter · Zombies · Co-op

Gunfire Reborn
Shared: Roguelite · Co-op · Indie

Call of Duty®: Black Ops III
Shared: Shooter · Zombies · Multiplayer

ARC Raiders
Shared: PvE · Shooter · Multiplayer

SYNTHETIK: Legion Rising
Shared: Roguelite · Indie · Shooter

World War Z
Shared: Shooter · Co-op · Zombies

Killing Floor 3
Shared: PvE · Shooter · Co-op

Jump Space
Shared: PvE · Roguelite · Co-op

Far Far West
Shared: PvE · Shooter · Co-op

Killing Floor 2
Shared: Shooter · Zombies · Gore

ELDEN RING NIGHTREIGN
Shared: Co-op · PvE · Roguelite

Killing Floor
Shared: Co-op · Zombies · Shooter

GTFO
Shared: Shooter · Co-op · Difficult

Paint the Town Red
Shared: Gore · Physics · Roguelite

Left 4 Dead
Shared: Co-op · Shooter · Zombies

Warhammer: Vermintide 2
Shared: Co-op · PvE · Multiplayer

Ravenswatch
Shared: Co-op · Roguelite · Indie

Slay the Spire 2
Shared: Co-op · Roguelite · Indie

Abyssus
Shared: Roguelite · Co-op · PvE