Games like Memento
Games like Memento include Papers, Please, OneShot, Firework, DISTRAINT: Deluxe Edition, and There Is No Game: Wrong Dimension. We matched them by the tags players give Memento on Steam (Puzzle, Tutorial, Strategy, 2D, and Horror): closest matches first, and among equally close ones the better-known games.

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

OneShot
Shared: Puzzle · Story Rich · Pixel Graphics

Firework
Shared: Puzzle · Horror · 2D

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

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

Sally Face - Episode One
Shared: Puzzle · Story Rich · Horror

OMORI
Shared: Story Rich · Multiple Endings · Pixel Graphics

The Rewinder
Shared: Puzzle · 2D · Pixel Graphics

Ib
Shared: Horror · 2D · Story Rich

Undertale
Shared: Story Rich · Multiple Endings · Pixel Graphics

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

Inscryption
Shared: Puzzle · Horror · Story Rich

Bendy and the Ink Machine
Shared: Puzzle · Horror · Strategy

Cat in the Box
Shared: Horror · 2D · Pixel Graphics

Paper Bride
Shared: Puzzle · Horror · 2D

Mad Father
Shared: Horror · 2D · Puzzle

Cookie Clicker
Shared: Horror · Casual · Pixel Graphics

The Witch's House MV
Shared: Horror · 2D · Pixel Graphics

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

Death Coming/死神来了
Shared: Puzzle · Strategy · Casual

Zup! S
Shared: Puzzle · 2D · Casual

Gunpoint
Shared: Puzzle · 2D · Strategy

Little Nightmares II
Shared: Puzzle · Horror · Story Rich

Poppy Playtime
Shared: Puzzle · Horror · Singleplayer