Games like CLOSED GALAXY ~ワタツミより愛をこめて~
Games like CLOSED GALAXY ~ワタツミより愛をこめて~ include Stray, Outer Wilds, AI: The Somnium Files, Tiny Bunny, and Raging Loop. We matched them by the tags players give CLOSED GALAXY ~ワタツミより愛をこめて~ on Steam (Sci-fi, Visual Novel, Mystery, Horror, and Adventure): closest matches first, and among equally close ones the better-known games.

Stray
Shared: Adventure · Cute · Singleplayer

Outer Wilds
Shared: Mystery · Exploration · Adventure

AI: The Somnium Files
Shared: Visual Novel · Mystery · Sci-fi

Tiny Bunny
Shared: Visual Novel · Horror · Singleplayer

Raging Loop
Shared: Visual Novel · Mystery · Adventure

Urban Myth Dissolution Center
Shared: Visual Novel · Mystery · Adventure

Firework
Shared: Horror · Mystery · Visual Novel

Return to Shironagasu Island
Shared: Visual Novel · Mystery · Adventure

It was a human.
Shared: Visual Novel · Adventure · Sci-fi

Zero Escape: Zero Time Dilemma
Shared: Visual Novel · Mystery · Sci-fi

Danganronpa: Trigger Happy Havoc
Shared: Visual Novel · Mystery · Horror

Firewatch
Shared: Adventure · Mystery · Exploration

SOMA
Shared: Horror · Sci-fi · Exploration

The Test
Shared: Choose Your Own Adventure · Visual Novel · Horror

STEINS;GATE
Shared: Visual Novel · Sci-fi · Adventure

Zero Escape: The Nonary Games
Shared: Visual Novel · Mystery · Sci-fi

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

Magical Girl Witch Trials
Shared: Visual Novel · Mystery · Cute

Slime Rancher
Shared: Cute · Adventure · Exploration

Subnautica
Shared: Horror · Exploration · Adventure

CARRION
Shared: Horror · Gore · Adventure

Five Nights at Freddy's: Into the Pit
Shared: Horror · Adventure · Exploration

Until Dawn™
Shared: Horror · Adventure · Choose Your Own Adventure

The Wolf Among Us
Shared: Adventure · Visual Novel · Choose Your Own Adventure