Games like Climb for Kittens
Games like Climb for Kittens include Portal 2, Slime Rancher, Garry's Mod, Totally Accurate Battle Simulator, and A Story About My Uncle. We matched them by the tags players give Climb for Kittens on Steam (Adventure, Simulation, Puzzle, Platformer, and Sandbox): closest matches first, and among equally close ones the better-known games.

Portal 2
Shared: Puzzle · Platformer · First-Person

Slime Rancher
Shared: Adventure · Simulation · Sandbox

Garry's Mod
Shared: Sandbox · Simulation · First-Person

Totally Accurate Battle Simulator
Shared: Simulation · Sandbox · Adventure

A Story About My Uncle
Shared: Adventure · Platformer · First-Person

Chained Together
Shared: Adventure · Platformer · Simulation

House Flipper
Shared: Simulation · Sandbox · Adventure

Human Fall Flat
Shared: Puzzle · Adventure · Sandbox

Poly Bridge
Shared: Simulation · Puzzle · Sandbox

PC Building Simulator
Shared: Simulation · Sandbox · 3D

Slime Rancher 2
Shared: Adventure · Simulation · First-Person

BONEWORKS
Shared: Sandbox · Adventure · Puzzle

Portal
Shared: Puzzle · 3D Platformer · First-Person

Wobbly Life
Shared: Adventure · Simulation · Sandbox

Besiege
Shared: Simulation · Sandbox · Puzzle

Moncage
Shared: Puzzle · Adventure · Indie

Kerbal Space Program
Shared: Simulation · Sandbox · Indie

The Last Campfire
Shared: Adventure · Puzzle · Indie

Scribblenauts Unlimited
Shared: Adventure · Puzzle · Sandbox

s&box
Shared: Sandbox · 3D Platformer · Casual

Pikuniku
Shared: Adventure · Puzzle · Indie

SchoolBoy Runaway
Shared: Adventure · Puzzle · Simulation

FEZ
Shared: Puzzle · Platformer · Adventure

Donut County
Shared: Puzzle · Adventure · Indie