Games like Karakulo 21
Games like Karakulo 21 include Cookie Clicker, Banana, Garry's Mod, Berry Bury Berry, and Timberman. We matched them by the tags players give Karakulo 21 on Steam (Casual, Arcade, Incremental, Puzzle Platformer, and 3D): closest matches first, and among equally close ones the better-known games.

Cookie Clicker
Shared: Incremental · Casual · Pixel Graphics

Banana
Shared: Incremental · Casual · Arcade

Garry's Mod
Shared: Casual · First-Person · Physics

Berry Bury Berry
Shared: Incremental · 3D · First-Person

Timberman
Shared: Casual · Pixel Graphics · Arcade

Portal
Shared: Puzzle Platformer · First-Person · Comedy

Goat Simulator
Shared: Casual · Comedy · Funny

Liars Bar
Shared: Casual · 3D · Indie

R.E.P.O.
Shared: Comedy · First-Person · 3D

Shelldiver
Shared: Casual · Incremental · Arcade

Donut County
Shared: Casual · Indie · Funny

To The Core
Shared: Casual · Incremental · Arcade

Nodebuster
Shared: Casual · Incremental · Arcade

Touhou Mystia's Izakaya
Shared: Casual · Pixel Graphics · Comedy

RV There Yet?
Shared: Funny · First-Person · 3D

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

Shower With Your Dad Simulator 2015: Do You Still Shower With Your Dad
Shared: Arcade · Casual · Funny

The Coin Game
Shared: Arcade · Casual · First-Person

Human Fall Flat
Shared: Puzzle Platformer · Funny · Physics

Who's Your Daddy?!
Shared: First-Person · Comedy · Casual

PowerWash Simulator
Shared: Casual · First-Person · 3D

Unfair Flips
Shared: Casual · Incremental · Pixel Graphics

PEAK
Shared: First-Person · 3D · Comedy

Dale & Dawson Stationery Supplies
Shared: Casual · 3D · First-Person