Games like Fated Flatline DX
Games like Fated Flatline DX include Undertale, Baldur's Gate 3, Vampire Survivors, DELTARUNE, and Persona 5 Royal. We matched them by the tags players give Fated Flatline DX on Steam (RPG, Bullet Hell, Choices Matter, Action, and Turn-Based Combat): closest matches first, and among equally close ones the better-known games.

Undertale
Shared: Choices Matter · RPG · Story Rich

Baldur's Gate 3
Shared: RPG · Choices Matter · Turn-Based Combat

Vampire Survivors
Shared: Bullet Hell · 2D · Pixel Graphics

DELTARUNE
Shared: RPG · Bullet Hell · Story Rich

Persona 5 Royal
Shared: RPG · JRPG · Turn-Based Combat

OCTOPATH TRAVELER™
Shared: RPG · JRPG · Turn-Based Combat

Yakuza: Like a Dragon
Shared: RPG · Action · Turn-Based Combat

The Witcher 3: Wild Hunt — Remastered
Shared: RPG · Choices Matter · Story Rich

Chained Echoes
Shared: RPG · JRPG · Turn-Based Combat

Clair Obscur: Expedition 33
Shared: RPG · Turn-Based Combat · JRPG

Persona 4 Golden
Shared: RPG · JRPG · Turn-Based Combat

Metaphor: ReFantazio
Shared: RPG · Turn-Based Combat · JRPG

Death Must Die
Shared: Bullet Hell · RPG · Action

Suikoden I&II HD Remaster Gate Rune and Dunan Unification Wars
Shared: RPG · JRPG · 2D

OMORI
Shared: RPG · Story Rich · Pixel Graphics

FINAL FANTASY
Shared: RPG · JRPG · Turn-Based Combat

Mass Effect™ Legendary Edition
Shared: RPG · Choices Matter · Story Rich

Warhammer 40,000: Rogue Trader
Shared: RPG · Choices Matter · Turn-Based Combat

CHRONO TRIGGER®
Shared: RPG · JRPG · Story Rich

STAR OCEAN THE SECOND STORY R
Shared: RPG · JRPG · Action

OneShot
Shared: Story Rich · Choices Matter · Pixel Graphics

DRAGON BALL Z: KAKAROT
Shared: RPG · Action · JRPG

The Witcher: Enhanced Edition Director's Cut
Shared: RPG · Choices Matter · Action

OCTOPATH TRAVELER II
Shared: RPG · JRPG · Choices Matter