Games like Obsidian
Games like Obsidian include Machinarium, The Roottrees are Dead, Old Man's Journey, There Is No Game: Wrong Dimension, and Fran Bow. We matched them by the tags players give Obsidian on Steam (Point & Click, FMV, Story Rich, Atmospheric, and Psychedelic): closest matches first, and among equally close ones the better-known games.
Machinarium
Shared: Point & Click · Puzzle · Atmospheric
The Roottrees are Dead
Shared: Point & Click · Story Rich · Puzzle
Old Man's Journey
Shared: Story Rich · Point & Click · Atmospheric
There Is No Game: Wrong Dimension
Shared: Point & Click · Puzzle · Story Rich
Fran Bow
Shared: Point & Click · Story Rich · Puzzle
Lost in Play
Shared: Point & Click · Story Rich · Puzzle
Gorogoa
Shared: Point & Click · Puzzle · Atmospheric
The Room
Shared: Point & Click · Atmospheric · Puzzle
No Case Should Remain Unsolved
Shared: Point & Click · Story Rich · Interactive Fiction
The Witcher 3: Wild Hunt — Remastered
Shared: Story Rich · Atmospheric · Adventure
Amanda the Adventurer
Shared: Story Rich · Puzzle · Old School
Servant of the Lake
Shared: Point & Click · Story Rich · Puzzle
The Case of the Golden Idol
Shared: Point & Click · Story Rich · Puzzle
Storyteller
Shared: Point & Click · Interactive Fiction · Puzzle
Sally Face - Episode One
Shared: Story Rich · Point & Click · Atmospheric
Unforeseen Incidents
Shared: Point & Click · Story Rich · Atmospheric
Brothers - A Tale of Two Sons
Shared: Story Rich · Atmospheric · Adventure
The Mermaid Mask
Shared: Point & Click · Interactive Fiction · Atmospheric
Syberia
Shared: Point & Click · Atmospheric · Story Rich
The Tiny Bang Story
Shared: Point & Click · Atmospheric · Puzzle
The Operator
Shared: Atmospheric · Puzzle · Point & Click
The Night of the Rabbit
Shared: Point & Click · Story Rich · Adventure
Spirit of the North
Shared: Atmospheric · Story Rich · Puzzle
Rusty Lake Paradise
Shared: Point & Click · Puzzle · Atmospheric