Games like Mainland
Games like Mainland include Samsara Room, Roadwarden, Where Winds Meet, To the Moon, and Idle Champions of the Forgotten Realms. We matched them by the tags players give Mainland on Steam (Free to Play, Adventure, Indie, Interactive Fiction, and Text-Based): closest matches first, and among equally close ones the better-known games.

Samsara Room
Shared: Indie · Adventure · Free to Play

Roadwarden
Shared: Adventure · Indie · Text-Based

Where Winds Meet
Shared: Free to Play · Adventure · Indie

To the Moon
Shared: Indie · Adventure · Interactive Fiction

Idle Champions of the Forgotten Realms
Shared: Free to Play · Adventure · Indie

Aimlabs
Shared: Free to Play · Adventure · Indie

The Mr. Rabbit Magic Show
Shared: Adventure · Free to Play · Indie

Florence
Shared: Indie · Adventure · Interactive Fiction

Apex Legends™
Shared: Free to Play · Adventure · Free To Play

Poppy Playtime
Shared: Free to Play · Indie · Adventure

Varenje
Shared: Free to Play · Adventure · Indie

CAYNE
Shared: Free to Play · Adventure · Indie

The Life and Suffering of Sir Brante
Shared: Interactive Fiction · Text-Based · Indie

There Is No Game: Wrong Dimension
Shared: Indie · Adventure · Interactive Fiction

No Case Should Remain Unsolved
Shared: Interactive Fiction · Adventure · Text-Based

Dark Deception
Shared: Free to Play · Indie · Adventure

One Dreamer: Prologue
Shared: Free to Play · Indie · Adventure

Stories Untold
Shared: Adventure · Indie · Text-Based

Palia
Shared: Free to Play · Adventure · Indie

Neverwinter
Shared: Free to Play · Adventure · Free To Play

Milk inside a bag of milk inside a bag of milk
Shared: Interactive Fiction · Adventure · Text-Based

Guild Wars 2®
Shared: Adventure · Free to Play · Free To Play

SMITE®
Shared: Free to Play · Indie · Adventure

Marvel Rivals
Shared: Free to Play · Adventure · Free To Play