Games like Sayonara Okaasan
Games like Sayonara Okaasan include Gorogoa, The Room, Storyteller, There Is No Game: Wrong Dimension, and Sally Face - Episode One. We matched them by the tags players give Sayonara Okaasan on Steam (Short, Point & Click, Narrative, Interactive Fiction, and Emotional): closest matches first, and among equally close ones the better-known games.

Gorogoa
Shared: Puzzle · Point & Click · Short

The Room
Shared: Point & Click · Puzzle · Short

Storyteller
Shared: Point & Click · Interactive Fiction · Puzzle

There Is No Game: Wrong Dimension
Shared: Point & Click · Puzzle · Casual

Sally Face - Episode One
Shared: Point & Click · Puzzle · Indie

To the Moon
Shared: Emotional · Interactive Fiction · Short

Morphopolis
Shared: Point & Click · Short · Puzzle

Zup! 2
Shared: Casual · Short · Puzzle

Before Your Eyes
Shared: Narrative · Emotional · Interactive Fiction

Machinarium
Shared: Point & Click · Puzzle · 2D

Zup!
Shared: Casual · Short · Puzzle

Samsara Room
Shared: Point & Click · Puzzle · Short

Zup! F
Shared: Casual · Short · Puzzle

LIMBO
Shared: Puzzle · Short · Singleplayer

The Room Two
Shared: Point & Click · Puzzle · Short

Hidden Folks
Shared: Point & Click · Casual · Puzzle

The White Door
Shared: Point & Click · Short · Puzzle

Zup! X
Shared: Casual · Short · Puzzle

Gomo
Shared: Point & Click · Short · Casual

Florence
Shared: Casual · Interactive Fiction · Singleplayer

Zup! S
Shared: Casual · Puzzle · Short

Papers, Please
Shared: Point & Click · Singleplayer · Puzzle

Zup! 3
Shared: Casual · Short · Puzzle

Old Man's Journey
Shared: Casual · Point & Click · Puzzle