Games like Shadows on the Vatican: Nightingale
Games like Shadows on the Vatican: Nightingale include Detroit: Become Human, Late Shift, Heavy Rain, Homicipher, and Life is Strange: Before the Storm. We matched them by the tags players give Shadows on the Vatican: Nightingale on Steam (Interactive Fiction, Text-Based, Choices Matter, Multiple Endings, and Female Protagonist): closest matches first, and among equally close ones the better-known games.

Detroit: Become Human
Shared: Choices Matter · Multiple Endings · Emotional

Late Shift
Shared: Choices Matter · Interactive Fiction · Multiple Endings

Heavy Rain
Shared: Choices Matter · Multiple Endings · Thriller

Homicipher
Shared: Female Protagonist · Text-Based · Multiple Endings

Life is Strange: Before the Storm
Shared: Choices Matter · Female Protagonist · Multiple Endings

Oxenfree
Shared: Choices Matter · Female Protagonist · Adventure

Life is Strange: True Colors
Shared: Choices Matter · Multiple Endings · Female Protagonist

Hellblade: Senua's Sacrifice
Shared: Female Protagonist · Psychological · Adventure

To the Moon
Shared: Interactive Fiction · Adventure · Emotional

Roadwarden
Shared: Text-Based · Interactive Fiction · Adventure

No, I'm not a Human
Shared: Choices Matter · Multiple Endings · Singleplayer

The Casting of Frank Stone™
Shared: Choices Matter · Multiple Endings · Adventure

The Coffin of Andy and Leyley
Shared: Multiple Endings · Choices Matter · Psychological

The Witcher 3: Wild Hunt — Remastered
Shared: Choices Matter · Adventure · Atmospheric

Road to Empress I
Shared: Choices Matter · Female Protagonist · Multiple Endings

Life is Strange Remastered
Shared: Choices Matter · Female Protagonist · Multiple Endings

Undertale
Shared: Choices Matter · Multiple Endings · Singleplayer

The Complex
Shared: Choices Matter · Interactive Fiction · Adventure

Suzerain
Shared: Interactive Fiction · Choices Matter · Text-Based

The Life and Suffering of Sir Brante
Shared: Choices Matter · Interactive Fiction · Text-Based

Stray Gods: The Roleplaying Musical
Shared: Interactive Fiction · Choices Matter · Female Protagonist

Beyond: Two Souls
Shared: Choices Matter · Female Protagonist · Adventure

Your Turn To Die -Death Game By Majority-
Shared: Multiple Endings · Female Protagonist · Interactive Fiction

Road 96
Shared: Choices Matter · Adventure · Multiple Endings