Games like Heartstop
Games like Heartstop include Life is Strange: True Colors, Life is Strange Remastered, Until Then, Lost Records: Bloom & Rage, and Detroit: Become Human. We matched them by the tags players give Heartstop on Steam (Interactive Fiction, Choices Matter, Emotional, LGBTQ+, and Multiple Endings): closest matches first, and among equally close ones the better-known games.

Life is Strange: True Colors
Shared: Choices Matter · LGBTQ+ · Multiple Endings

Life is Strange Remastered
Shared: Choices Matter · LGBTQ+ · Emotional

Until Then
Shared: Emotional · Interactive Fiction · Mystery

Lost Records: Bloom & Rage
Shared: Choices Matter · LGBTQ+ · Female Protagonist

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

Life is Strange: Double Exposure
Shared: Choices Matter · LGBTQ+ · Female Protagonist

Life is Strange: Before the Storm Remastered
Shared: Choices Matter · LGBTQ+ · Female Protagonist

Love Curse: Find Your Soulmate
Shared: LGBTQ+ · Choices Matter · Female Protagonist

To the Moon
Shared: Emotional · Interactive Fiction · Singleplayer

The Cosmic Wheel Sisterhood
Shared: Interactive Fiction · LGBTQ+ · Choices Matter

Love Is All Around
Shared: Choices Matter · Interactive Fiction · Multiple Endings

a new life.
Shared: LGBTQ+ · Emotional · Choices Matter

Sweet Home
Shared: LGBTQ+ · Interactive Fiction · Female Protagonist

Finding Paradise
Shared: Emotional · Interactive Fiction · Singleplayer

Coffee Talk
Shared: Interactive Fiction · LGBTQ+ · Choices Matter

Refind Self: The Personality Test Game
Shared: Interactive Fiction · Female Protagonist · Emotional

OPUS: Echo of Starsong - Full Bloom Edition
Shared: Emotional · Interactive Fiction · Female Protagonist

Impostor Factory
Shared: Emotional · Singleplayer · Interactive Fiction

Undertale
Shared: Choices Matter · Multiple Endings · Singleplayer

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

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

Life is Strange: Reunion
Shared: Choices Matter · LGBTQ+ · Emotional

BAD END THEATER
Shared: Multiple Endings · LGBTQ+ · Choices Matter

Road 96
Shared: Choices Matter · Multiple Endings · Emotional