Games like Martial Law
Games like Martial Law include OneShot, Undertale, Detroit: Become Human, OMORI, and The Red Strings Club. We matched them by the tags players give Martial Law on Steam (Pixel Graphics, Free to Play, Choices Matter, Multiple Endings, and Atmospheric): closest matches first, and among equally close ones the better-known games.

OneShot
Shared: Pixel Graphics · Story Rich · Atmospheric

Undertale
Shared: Choices Matter · Pixel Graphics · Multiple Endings

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

OMORI
Shared: Pixel Graphics · Story Rich · Multiple Endings

The Red Strings Club
Shared: Pixel Graphics · Choices Matter · Story Rich

The Test
Shared: Pixel Graphics · Multiple Endings · Story Rich

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

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

Finding Paradise
Shared: Pixel Graphics · Story Rich · Adventure

Coffee Talk
Shared: Pixel Graphics · Atmospheric · Story Rich

To the Moon
Shared: Pixel Graphics · Story Rich · Indie

SANABI
Shared: Pixel Graphics · Story Rich · Adventure

The Wolf Among Us
Shared: Multiple Endings · Choices Matter · Story Rich

Road 96
Shared: Choices Matter · Story Rich · Atmospheric

Impostor Factory
Shared: Pixel Graphics · Story Rich · Adventure

A Bird Story
Shared: Pixel Graphics · Story Rich · Indie

Back to the Dawn
Shared: Pixel Graphics · Choices Matter · Story Rich

Outcore: Desktop Adventure
Shared: Free to Play · Story Rich · Adventure

Tales of the Black Forest
Shared: Pixel Graphics · Story Rich · Adventure

Milk outside a bag of milk outside a bag of milk
Shared: Pixel Graphics · Story Rich · Multiple Endings

Oxenfree
Shared: Choices Matter · Story Rich · Atmospheric

Yes, Your Grace
Shared: Choices Matter · Pixel Graphics · Indie

Five Nights at Freddy's: Into the Pit
Shared: Pixel Graphics · Adventure · Multiple Endings

Love, Money, Rock'n'Roll
Shared: Multiple Endings · Atmospheric · Choices Matter