Games like Alter Ego
Games like Alter Ego include Reigns, My Time at Portia, Stardew Valley, Growing Up, and Emily is Away Too. We matched them by the tags players give Alter Ego on Steam (Simulation, RPG, Casual, Indie, and Adventure): closest matches first, and among equally close ones the better-known games.

Reigns
Shared: Indie · Choices Matter · RPG

My Time at Portia
Shared: RPG · Simulation · Life Sim

Stardew Valley
Shared: RPG · Simulation · Life Sim

Growing Up
Shared: Simulation · RPG · Choices Matter

Emily is Away Too
Shared: Simulation · Indie · Casual

Chinese Parents
Shared: Simulation · Casual · RPG

Volcano Princess
Shared: RPG · Simulation · Life Sim

Yes, Your Grace
Shared: Indie · RPG · Choices Matter

The Life and Suffering of Sir Brante
Shared: RPG · Choices Matter · Text-Based

Emily is Away <3
Shared: Simulation · Indie · Choices Matter

Monster Loves You!
Shared: Casual · Simulation · Indie

Home Behind
Shared: RPG · Adventure · Simulation

鬼谷八荒 Tale of Immortal
Shared: Simulation · RPG · Adventure

Roadwarden
Shared: RPG · Indie · Adventure

The Scroll of Taiwu : Beyond The Dome
Shared: RPG · Indie · Simulation

Plebby Quest: The Crusades
Shared: Casual · RPG · Simulation

Retirement Simulator
Shared: Simulation · RPG · Indie

Streamer Life Simulator
Shared: Simulation · Casual · Life Sim

The Sims™ 3
Shared: Simulation · Life Sim · Casual

Magical Princess
Shared: RPG · Simulation · Life Sim

The Test
Shared: Simulation · Choose Your Own Adventure · Choices Matter

Hello Kitty Island Adventure
Shared: Simulation · Adventure · Casual

DAVE THE DIVER
Shared: Casual · Adventure · RPG

That's not my Neighbor
Shared: Casual · Adventure · Simulation