Games like Lunacy: Saint Rhodes
Games like Lunacy: Saint Rhodes include Five Nights at Freddy's: Security Breach, Amnesia: Rebirth, SOMA, Poppy Playtime, and Still Wakes the Deep. We matched them by the tags players give Lunacy: Saint Rhodes on Steam (Lovecraftian, Singleplayer, Action, Horror, and Exploration): closest matches first, and among equally close ones the better-known games.

Five Nights at Freddy's: Security Breach
Shared: Singleplayer · Horror · Exploration

Amnesia: Rebirth
Shared: Singleplayer · Puzzle · Action-Adventure

SOMA
Shared: Horror · Exploration · Singleplayer

Poppy Playtime
Shared: Singleplayer · Horror · Puzzle

Still Wakes the Deep
Shared: Lovecraftian · Horror · Walking Simulator

Layers of Fear (2016)
Shared: Horror · Singleplayer · Walking Simulator

Escape the Backrooms
Shared: Horror · Exploration · Singleplayer

Garten of Banban
Shared: Singleplayer · Horror · Puzzle

What Remains of Edith Finch
Shared: Walking Simulator · Singleplayer · Exploration

In Sound Mind
Shared: Horror · Action · Singleplayer

Rise of the Tomb Raider™
Shared: Action · Singleplayer · Exploration

Bendy and the Dark Revival
Shared: Singleplayer · Horror · Action

The Exit 8
Shared: Exploration · Horror · Puzzle

Amnesia: A Machine For Pigs
Shared: Horror · Walking Simulator · Exploration

Amnesia: The Dark Descent
Shared: Horror · Puzzle · Lovecraftian

Little Nightmares II
Shared: Singleplayer · Horror · Puzzle

Firewatch
Shared: Singleplayer · Walking Simulator · Exploration

Indiana Jones and the Great Circle
Shared: Singleplayer · Action-Adventure · Puzzle

MiSide
Shared: Horror · Singleplayer · Psychological Horror

The Room 4: Old Sins
Shared: Lovecraftian · Puzzle · Singleplayer

Tomb Raider Game of the Year
Shared: Action · Singleplayer · Exploration

Resident Evil 7 Biohazard
Shared: Horror · Singleplayer · First-Person

Resident Evil Requiem
Shared: Horror · Action · Singleplayer

Five Nights at Freddy's: Secret of the Mimic
Shared: Horror · Action · First-Person