Games like Happy Island Life
Games like Happy Island Life include BioShock Infinite, Rust, PUBG: BATTLEGROUNDS, Garry's Mod, and Apex Legends™. We matched them by the tags players give Happy Island Life on Steam (Casual, Adventure, Action, RPG, and Action-Adventure): closest matches first, and among equally close ones the better-known games.

BioShock Infinite
Shared: Action · Shooter · Adventure

Rust
Shared: Adventure · Sandbox · Action

PUBG: BATTLEGROUNDS
Shared: Battle Royale · Shooter · Action

Garry's Mod
Shared: Casual · Sandbox · Building

Apex Legends™
Shared: Battle Royale · Action · Shooter

Fallout 4
Shared: Adventure · RPG · Shooter

Atomic Heart
Shared: Adventure · Action · Action-Adventure

Far Cry 3
Shared: Action · Adventure · Shooter

VLADiK BRUTAL
Shared: Action · Adventure · Shooter

Black Myth: Wukong
Shared: Action · RPG · Action-Adventure

Borderlands 2
Shared: Action · Shooter · RPG

Grand Theft Auto V Legacy
Shared: Action · Adventure · Shooter

BONELAB
Shared: Action · Shooter · Sandbox

Far Cry® 6
Shared: Action-Adventure · Action · Adventure

s&box
Shared: Casual · Action · Sandbox

Lost
Shared: Casual · Adventure · Nudity

Necromunda: Hired Gun
Shared: Adventure · Action · Shooter

Half-Life 2
Shared: Action · Adventure · FPS

Cyberpunk 2077
Shared: RPG · Nudity · FPS

God of War Ragnarök
Shared: Adventure · Action · RPG

Freeman: Guerrilla Warfare
Shared: Action · RPG · Shooter

Crimson Desert Enhanced
Shared: Action · Adventure · RPG

Far Cry® 4
Shared: Action · Adventure · FPS

Portal Knights
Shared: Adventure · RPG · Sandbox