Games like RD Mars
Games like RD Mars include OMORI, SANABI, DISTRAINT: Deluxe Edition, OneShot, and BOKURA. We matched them by the tags players give RD Mars on Steam (Top-Down Shooter, Psychological Horror, Story Rich, Action, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

OMORI
Shared: Psychological Horror · Story Rich · Pixel Graphics

SANABI
Shared: Story Rich · Pixel Graphics · Action

DISTRAINT: Deluxe Edition
Shared: Psychological Horror · Pixel Graphics · Story Rich

OneShot
Shared: Story Rich · Pixel Graphics · Indie

BOKURA
Shared: Psychological Horror · Pixel Graphics · Action

Ib
Shared: Story Rich · Pixel Graphics · Psychological Horror

DISTRAINT 2
Shared: Psychological Horror · Story Rich · Side Scroller

Mad Father
Shared: Psychological Horror · Pixel Graphics · Story Rich

Outcore: Desktop Adventure
Shared: Psychological Horror · Story Rich · Exploration

Sally Face - Episode One
Shared: Psychological Horror · Story Rich · Horror

SILENT HILL f
Shared: Psychological Horror · Story Rich · Action

SOMA
Shared: Psychological Horror · Story Rich · Horror

Night in the Woods
Shared: Story Rich · Exploration · Psychological Horror

In Sound Mind
Shared: Psychological Horror · Story Rich · Action

Tomb Raider Game of the Year
Shared: Action · Story Rich · Adventure

Darkwood
Shared: Psychological Horror · Action · Story Rich

Broforce
Shared: Action · Pixel Graphics · 2D

Impostor Factory
Shared: Story Rich · Pixel Graphics · 2D

D'LIRIUM
Shared: Top-Down Shooter · Psychological Horror · 2D

Undertale
Shared: Story Rich · Pixel Graphics · Choices Matter

Escape From Duckov
Shared: Action · Top-Down Shooter · Exploration

Urban Myth Dissolution Center
Shared: Psychological Horror · Pixel Graphics · Story Rich

Skul: The Hero Slayer
Shared: Action · Pixel Graphics · 2D

Five Nights at Freddy's: Into the Pit
Shared: Pixel Graphics · 2D · Exploration