Games like Welcome To Mars 9
Games like Welcome To Mars 9 include To the Moon, SANABI, OneShot, Undertale, and A Bird Story. We matched them by the tags players give Welcome To Mars 9 on Steam (Indie, Short, Narrative, Story Rich, and Dialogue Heavy): closest matches first, and among equally close ones the better-known games.

To the Moon
Shared: Indie · Story Rich · Adventure

SANABI
Shared: Story Rich · Indie · Pixel Graphics

OneShot
Shared: Indie · Story Rich · Pixel Graphics

Undertale
Shared: Story Rich · Indie · Pixel Graphics

A Bird Story
Shared: Indie · Story Rich · Short

The Red Strings Club
Shared: Story Rich · Indie · Pixel Graphics

Papers, Please
Shared: Indie · Story Rich · Pixel Graphics

Impostor Factory
Shared: Story Rich · Adventure · Pixel Graphics

DISTRAINT: Deluxe Edition
Shared: Indie · Story Rich · Adventure

Detroit: Become Human
Shared: Story Rich · Choices Matter · Singleplayer

Gone Home
Shared: Short · Indie · Story Rich

Florence
Shared: Indie · Story Rich · Adventure

OMORI
Shared: Indie · Story Rich · Pixel Graphics

Brothers - A Tale of Two Sons
Shared: Indie · Story Rich · Adventure

Finding Paradise
Shared: Story Rich · Adventure · Pixel Graphics

Celeste
Shared: Indie · Pixel Graphics · Story Rich

Before Your Eyes
Shared: Narrative · Indie · Story Rich

Katana ZERO
Shared: Story Rich · Indie · Pixel Graphics

There Is No Game: Wrong Dimension
Shared: Indie · Adventure · Story Rich

Firewatch
Shared: Story Rich · Adventure · Indie

The Beginner's Guide
Shared: Indie · Story Rich · Short

Night in the Woods
Shared: Story Rich · Adventure · Narrative

The Invincible
Shared: Adventure · Dialogue Heavy · Indie

Replica
Shared: Indie · Story Rich · Pixel Graphics