Games like Nanny
Games like Nanny include Outlast, Five Nights at Freddy's: Security Breach, Five Nights at Freddy's: Secret of the Mimic, Poppy Playtime, and Little Nightmares. We matched them by the tags players give Nanny on Steam (Adventure, 3D, First-Person, Pixel Graphics, and Stylized): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: First-Person · Atmospheric · Horror

Five Nights at Freddy's: Security Breach
Shared: First-Person · 3D · Adventure

Five Nights at Freddy's: Secret of the Mimic
Shared: Adventure · First-Person · 3D

Poppy Playtime
Shared: First-Person · Horror · Dark

Little Nightmares
Shared: Adventure · Atmospheric · Horror

Choo-Choo Charles
Shared: First-Person · 3D · Survival Horror

PEAK
Shared: Adventure · First-Person · 3D

Bendy and the Dark Revival
Shared: First-Person · Adventure · Horror

Little Nightmares II
Shared: Adventure · Atmospheric · Horror

Penumbra Overture
Shared: Adventure · First-Person · Atmospheric

IMSCARED
Shared: Adventure · Pixel Graphics · First-Person

Firewatch
Shared: Adventure · Atmospheric · First-Person

Lethal Company
Shared: First-Person · Horror · Survival Horror

Escape the Backrooms
Shared: First-Person · Adventure · Horror

Thief
Shared: Adventure · First-Person · Stealth

Amnesia: The Dark Descent
Shared: First-Person · Atmospheric · Horror

The Outlast Trials
Shared: First-Person · Horror · Survival Horror

Garten of Banban
Shared: First-Person · 3D · Horror

Outlast 2
Shared: First-Person · Horror · Atmospheric

Amnesia: Rebirth
Shared: First-Person · Adventure · Horror

Inside the Backrooms
Shared: Adventure · Horror · First-Person

Among the Sleep - Enhanced Edition
Shared: Adventure · First-Person · Atmospheric

Slender: The Arrival
Shared: First-Person · Horror · Adventure

Happy's Humble Burger Farm
Shared: First-Person · Adventure · Atmospheric