Games like HEADLINER
Games like HEADLINER include Undertale, Beholder, Papers, Please, OneShot, and Beholder 2. We matched them by the tags players give HEADLINER on Steam (Indie, Adventure, Choices Matter, Multiple Endings, and Political Sim): closest matches first, and among equally close ones the better-known games.

Undertale
Shared: Choices Matter · Multiple Endings · Story Rich

Beholder
Shared: Choices Matter · Political Sim · Dystopian

Papers, Please
Shared: Indie · Multiple Endings · Dystopian

OneShot
Shared: Indie · Story Rich · Choices Matter

Beholder 2
Shared: Choices Matter · Dystopian · Political Sim

Beholder Conductor
Shared: Choices Matter · Indie · Political Sim

Detroit: Become Human
Shared: Choices Matter · Multiple Endings · Story Rich

Not For Broadcast
Shared: Adventure · Choices Matter · Dystopian

To the Moon
Shared: Indie · Adventure · Story Rich

Emily is Away <3
Shared: Choices Matter · Indie · Multiple Endings

Orwell: Keeping an Eye On You
Shared: Choices Matter · Political Sim · Indie

Emily is Away Too
Shared: Indie · Choices Matter · Multiple Endings

Little Misfortune
Shared: Indie · Choices Matter · Adventure

Do Not Feed the Monkeys
Shared: Political Sim · Choices Matter · Multiple Endings

Road 96
Shared: Choices Matter · Adventure · Multiple Endings

That's not my Neighbor
Shared: Adventure · Choices Matter · Indie

The Wolf Among Us
Shared: Adventure · Multiple Endings · Choices Matter

Oxenfree
Shared: Choices Matter · Indie · Story Rich

LoveChoice
Shared: Choices Matter · Multiple Endings · Story Rich

Florence
Shared: Indie · Adventure · Story Rich

There Is No Game: Wrong Dimension
Shared: Indie · Adventure · Story Rich

The Test
Shared: Multiple Endings · Story Rich · Choices Matter

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

Death and Taxes
Shared: Choices Matter · Multiple Endings · Story Rich