Games like Depression Quest
Games like Depression Quest include Emily is Away, To the Moon, The Test, The Life and Suffering of Sir Brante, and Suzerain. We matched them by the tags players give Depression Quest on Steam (Short, Indie, Free to Play, Interactive Fiction, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Emily is Away
Shared: Free to Play · Indie · Singleplayer

To the Moon
Shared: Indie · Singleplayer · Interactive Fiction

The Test
Shared: Choose Your Own Adventure · Singleplayer · Psychological

The Life and Suffering of Sir Brante
Shared: Interactive Fiction · Choose Your Own Adventure · Indie

Suzerain
Shared: Choose Your Own Adventure · Visual Novel · Interactive Fiction

The NOexistenceN of you AND me
Shared: Visual Novel · Interactive Fiction · Psychological Horror

Milk inside a bag of milk inside a bag of milk
Shared: Visual Novel · Interactive Fiction · Psychological Horror

Slay the Princess — The Pristine Cut
Shared: Visual Novel · Choose Your Own Adventure · Psychological Horror

A Bird Story
Shared: Indie · Short · Singleplayer

Milk outside a bag of milk outside a bag of milk
Shared: Indie · Visual Novel · Psychological Horror

Sweet Home
Shared: Interactive Fiction · Visual Novel · Indie

NEEDY STREAMER OVERLOAD
Shared: Visual Novel · Psychological Horror · Psychological

Roadwarden
Shared: Indie · Interactive Fiction · Text-Based

Love Is All Around
Shared: Singleplayer · Visual Novel · Interactive Fiction

Samsara Room
Shared: Indie · Free to Play · Short

The Hungry Lamb: Traveling in the Late Ming Dynasty
Shared: Visual Novel · Interactive Fiction · Indie

The Coffin of Andy and Leyley
Shared: Psychological · Visual Novel · Singleplayer

Ultimate Custom Night
Shared: Free to Play · Singleplayer · Indie

Poppy Playtime
Shared: Free to Play · Singleplayer · Indie

Our Life: Beginnings & Always
Shared: Visual Novel · Free to Play · Choose Your Own Adventure

No, I'm not a Human
Shared: Indie · Singleplayer · Psychological Horror

Choice of Robots
Shared: Choose Your Own Adventure · Interactive Fiction · Indie

The Beginner's Guide
Shared: Indie · Short · Singleplayer

Far Away
Shared: Singleplayer · Visual Novel · Choose Your Own Adventure

