Games like Apollo Cosmic
Games like Apollo Cosmic include SOMA, ROUTINE, Firewatch, What Remains of Edith Finch, and Layers of Fear (2016). We matched them by the tags players give Apollo Cosmic on Steam (Exploration, Collectathon, Casual, Psychological Horror, and Adventure): closest matches first, and among equally close ones the better-known games.

SOMA
Shared: Psychological Horror · Exploration · Atmospheric

ROUTINE
Shared: Psychological Horror · Singleplayer · Adventure

Firewatch
Shared: Adventure · Exploration · Atmospheric

What Remains of Edith Finch
Shared: Exploration · Atmospheric · Adventure

Layers of Fear (2016)
Shared: Psychological Horror · Singleplayer · Atmospheric

Outer Wilds
Shared: Exploration · Adventure · Atmospheric

Escape the Backrooms
Shared: Psychological Horror · Exploration · Horror

Outlast
Shared: Psychological Horror · First-Person · Singleplayer

Poppy Playtime
Shared: Singleplayer · Psychological Horror · First-Person

MiSide
Shared: Psychological Horror · Singleplayer · First-Person

Lethal Company
Shared: Exploration · First-Person · Psychological Horror

Still Wakes the Deep
Shared: Psychological Horror · First-Person · Horror

Fears to Fathom - Woodbury Getaway
Shared: Psychological Horror · Adventure · Casual

Scanner Sombre
Shared: Exploration · Adventure · Psychological Horror

Garten of Banban
Shared: Psychological Horror · Singleplayer · First-Person

Little Nightmares II
Shared: Adventure · Singleplayer · Psychological Horror

Visage
Shared: Psychological Horror · Singleplayer · Horror

The Exit 8
Shared: Exploration · Psychological Horror · Horror

Inside the Backrooms
Shared: Psychological Horror · Exploration · Adventure

POOLS
Shared: Psychological Horror · Exploration · Atmospheric

Five Nights at Freddy's: Security Breach
Shared: Singleplayer · Exploration · First-Person

Little Nightmares
Shared: Adventure · Singleplayer · Atmospheric

Stray
Shared: Adventure · Exploration · Singleplayer

Slime Rancher
Shared: Exploration · Adventure · Singleplayer