Games like Hundred
Games like Hundred include Cookie Clicker, The Adventure of NAYU, Click the Button, That's not my Neighbor, and Melvor Idle. We matched them by the tags players give Hundred on Steam (Casual, Point & Click, Incremental, 2D, and Fantasy): closest matches first, and among equally close ones the better-known games.

Cookie Clicker
Shared: Incremental · Casual · Indie

The Adventure of NAYU
Shared: Casual · Incremental · 2D

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

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

Melvor Idle
Shared: Casual · 2D · Indie

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

To The Core
Shared: Casual · Incremental · 2D

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

Idle Champions of the Forgotten Realms
Shared: Incremental · Fantasy · Casual

Game Dev Tycoon
Shared: Casual · Indie · 2D

Timberman
Shared: Casual · 2D · Indie

Keep on Mining!
Shared: Casual · Incremental · Indie

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

Gorogoa
Shared: Casual · Indie · Point & Click

Storyteller
Shared: Point & Click · 2D · Fantasy

Hidden Folks
Shared: Casual · Point & Click · Indie

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

Russian Life Simulator
Shared: Incremental · 2D · Singleplayer

Kingdom Rush - Tower Defense
Shared: 2D · Casual · Fantasy

Zup!
Shared: Casual · 2D · Indie

Zup! 2
Shared: Casual · 2D · Indie

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

Zup! F
Shared: Casual · 2D · Indie

Zup! X
Shared: Casual · 2D · Indie