Games like Alone Among the Ruins
Games like Alone Among the Ruins include Fallout 4, Fallout: New Vegas, God of War, Days Gone, and Middle-earth: Shadow of War. We matched them by the tags players give Alone Among the Ruins on Steam (RPG, Action, Adventure, Post-apocalyptic, and Zombies): closest matches first, and among equally close ones the better-known games.

Fallout 4
Shared: Post-apocalyptic · RPG · Adventure

Fallout: New Vegas
Shared: RPG · Post-apocalyptic · Singleplayer

God of War
Shared: Action · Adventure · Singleplayer

Days Gone
Shared: Zombies · Post-apocalyptic · Singleplayer

Middle-earth: Shadow of War
Shared: Action · RPG · Adventure

Biomutant
Shared: Action · RPG · Adventure

Remnant: From the Ashes
Shared: Action · RPG · Adventure

Black Myth: Wukong
Shared: Action · RPG · Singleplayer

The Witcher 3: Wild Hunt — Remastered
Shared: RPG · Adventure · Singleplayer

ELEX
Shared: RPG · Post-apocalyptic · Singleplayer

South Park™: The Stick of Truth™
Shared: RPG · Adventure · Action

Fallout 3
Shared: RPG · Post-apocalyptic · Singleplayer

NieR Replicant™ ver.1.22474487139...
Shared: Action · RPG · Adventure

Crimson Desert Enhanced
Shared: Action · Adventure · Singleplayer

FINAL FANTASY VII REBIRTH
Shared: RPG · Action · Adventure

Kingdom Come: Deliverance II
Shared: RPG · Singleplayer · Adventure

BioShock Infinite
Shared: Action · RPG · Singleplayer

Monster Hunter: World
Shared: Action · RPG · Adventure

Dragon's Dogma 2
Shared: RPG · Action · Adventure

Yakuza: Like a Dragon
Shared: RPG · Action · Adventure

The Elder Scrolls Online - Standard Edition
Shared: RPG · Adventure · Action

DRAGON BALL Z: KAKAROT
Shared: RPG · Action · Singleplayer

Eastward
Shared: Adventure · RPG · Singleplayer

Stellar Blade™
Shared: Action · Singleplayer · Post-apocalyptic