Games like Kill Ralph
Games like Kill Ralph include Slay the Princess — The Pristine Cut, Suzerain, Storyteller, Endless Monday: Dreams and Deadlines, and The Wolf Among Us. We matched them by the tags players give Kill Ralph on Steam (Visual Novel, Choices Matter, Adventure, Interactive Fiction, and Point & Click): closest matches first, and among equally close ones the better-known games.

Slay the Princess — The Pristine Cut
Shared: Visual Novel · Choices Matter · Choose Your Own Adventure

Suzerain
Shared: Visual Novel · Choices Matter · Choose Your Own Adventure

Storyteller
Shared: Interactive Fiction · Point & Click · Adventure

Endless Monday: Dreams and Deadlines
Shared: Visual Novel · Interactive Fiction · Choices Matter

The Wolf Among Us
Shared: Adventure · Choices Matter · Visual Novel

Refind Self: The Personality Test Game
Shared: Visual Novel · Interactive Fiction · Adventure

Far Away
Shared: Visual Novel · Choices Matter · Choose Your Own Adventure

The Life and Suffering of Sir Brante
Shared: Choices Matter · Visual Novel · Interactive Fiction

Vampires' Melody
Shared: Visual Novel · Adventure · Interactive Fiction

Sovereign Tower
Shared: Choices Matter · Visual Novel · Choose Your Own Adventure

and Roger
Shared: Visual Novel · Interactive Fiction · Point & Click

The Henry Stickmin Collection
Shared: Choices Matter · Choose Your Own Adventure · Point & Click

LoveChoice
Shared: Choices Matter · Visual Novel · Simulation

Death and Taxes
Shared: Choices Matter · Point & Click · Simulation

Ken Follett's The Pillars of the Earth
Shared: Choices Matter · Visual Novel · Adventure

One Night Stand
Shared: Visual Novel · Choices Matter · Point & Click

Rewrite+
Shared: Visual Novel · Adventure · Interactive Fiction

Five Dates
Shared: Choices Matter · Visual Novel · Adventure

Love, Money, Rock'n'Roll
Shared: Visual Novel · Choices Matter · Anime

No Case Should Remain Unsolved
Shared: Visual Novel · Interactive Fiction · Point & Click

That's not my Neighbor
Shared: Adventure · Choices Matter · Point & Click

Tiny Bunny
Shared: Visual Novel · Choices Matter · 2D

Class of '09: The Re-Up
Shared: Visual Novel · Choose Your Own Adventure · Anime

The Crown of Leaves
Shared: Visual Novel · Adventure · Point & Click