Games like KILL AI
Games like KILL AI include Undertale, OneShot, Reventure, Papers, Please, and OMORI. We matched them by the tags players give KILL AI on Steam (2D, Pixel Graphics, Programming, PvE, and Multiple Endings): closest matches first, and among equally close ones the better-known games.

Undertale
Shared: Pixel Graphics · Multiple Endings · Choices Matter

OneShot
Shared: Pixel Graphics · 2D · Choices Matter

Reventure
Shared: Pixel Graphics · 2D · Multiple Endings

Papers, Please
Shared: Pixel Graphics · Multiple Endings · Singleplayer

OMORI
Shared: Pixel Graphics · Multiple Endings · 2D

Kindergarten 2
Shared: Pixel Graphics · Adventure · 2D

Baba Is You
Shared: Pixel Graphics · 2D · Singleplayer

Please, Don’t Touch Anything
Shared: Pixel Graphics · 2D · Multiple Endings

Five Nights at Freddy's: Into the Pit
Shared: Pixel Graphics · 2D · Singleplayer

Martial Law
Shared: Pixel Graphics · Multiple Endings · Choices Matter

Changed
Shared: Pixel Graphics · 2D · Singleplayer

CARRION
Shared: Pixel Graphics · 2D · Violent

DISTRAINT: Deluxe Edition
Shared: Pixel Graphics · 2D · Indie

Blasphemous
Shared: Pixel Graphics · 2D · Violent

Terraria
Shared: 2D · Pixel Graphics · Adventure

People Playground
Shared: 2D · Violent · Singleplayer

Milk outside a bag of milk outside a bag of milk
Shared: Pixel Graphics · Multiple Endings · 2D

NEEDY STREAMER OVERLOAD
Shared: Pixel Graphics · 2D · Multiple Endings

There Is No Game: Wrong Dimension
Shared: Pixel Graphics · 2D · Indie

Kindergarten
Shared: Pixel Graphics · Choices Matter · Singleplayer

The Test
Shared: Pixel Graphics · Multiple Endings · Choices Matter

Ib
Shared: Pixel Graphics · 2D · Indie

Heartbound
Shared: Pixel Graphics · 2D · Adventure

The Escapists
Shared: Pixel Graphics · 2D · Singleplayer