Games like Ninja Skills
Games like Ninja Skills include Timberman, Russian Life Simulator, Cookie Clicker, There Is No Game: Wrong Dimension, and Click the Button. We matched them by the tags players give Ninja Skills on Steam (Casual, Point & Click, Incremental, 2D, and Ninja): closest matches first, and among equally close ones the better-known games.

Timberman
Shared: Casual · 2D · Indie

Russian Life Simulator
Shared: Incremental · 2D · Singleplayer

Cookie Clicker
Shared: Incremental · Casual · Indie

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

Click the Button
Shared: Casual · Incremental · Point & Click

That's not my Neighbor
Shared: Casual · Point & Click · Indie

Vampire Survivors
Shared: 2D · Casual · Singleplayer

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

To The Core
Shared: Casual · Incremental · 2D

Game Dev Tycoon
Shared: Casual · Indie · Singleplayer

Zup! 2
Shared: Casual · 2D · Indie

Zup!
Shared: Casual · 2D · Indie

Keep on Mining!
Shared: Casual · Incremental · Singleplayer

Mark of the Ninja
Shared: Ninja · 2D · Indie

Gorogoa
Shared: Casual · Point & Click · Singleplayer

Zup! S
Shared: Casual · 2D · Indie

Shelldiver
Shared: Casual · Incremental · 2D

Hidden Folks
Shared: Casual · Point & Click · Indie

Zup! 4
Shared: Casual · 2D · Indie

A Game About Feeding A Black Hole
Shared: Casual · Incremental · 2D

Zup! 3
Shared: Casual · 2D · Indie

Melvor Idle
Shared: Casual · Singleplayer · 2D

A Dance of Fire and Ice
Shared: Singleplayer · 2D · Indie

Please, Don’t Touch Anything
Shared: Point & Click · Casual · Indie