Games like Kitten'd
Games like Kitten'd include Slime Rancher, Garry's Mod, Totally Accurate Battle Simulator, Wobbly Life, and SuchArt: Creative Space. We matched them by the tags players give Kitten'd on Steam (Simulation, Casual, Adventure, Family Friendly, and Funny): closest matches first, and among equally close ones the better-known games.
Slime Rancher
Shared: Adventure · Singleplayer · Simulation
Garry's Mod
Shared: Casual · Funny · Sandbox
Totally Accurate Battle Simulator
Shared: Simulation · Funny · Sandbox
Wobbly Life
Shared: Adventure · Simulation · Casual
SuchArt: Creative Space
Shared: Simulation · Singleplayer · Adventure
Kerbal Space Program
Shared: Simulation · Space · Sandbox
Goat Simulator
Shared: Simulation · Funny · Casual
Youtubers Life
Shared: Casual · Simulation · Singleplayer
The Sims™ 3
Shared: Simulation · Casual · Singleplayer
Planet Coaster
Shared: Simulation · Family Friendly · Sandbox
Job Simulator
Shared: Simulation · VR · Funny
Cooking Simulator
Shared: Simulation · Singleplayer · Funny
SPORE™
Shared: Simulation · Casual · Sandbox
Elite Dangerous
Shared: Simulation · Space · VR
Vacation Simulator
Shared: Simulation · VR · Funny
House Flipper
Shared: Simulation · Singleplayer · Casual
Rick and Morty: Virtual Rick-ality
Shared: Simulation · Adventure · VR
PowerWash Simulator
Shared: Casual · Simulation · Funny
Trailmakers
Shared: Family Friendly · Space · Adventure
BONEWORKS
Shared: VR · Adventure · Singleplayer
Golf With Your Friends
Shared: Casual · Funny · Family Friendly
Thief Simulator
Shared: Simulation · Singleplayer · Adventure
The Sims™ 4
Shared: Simulation · Singleplayer · Casual
Scribblenauts Unlimited
Shared: Casual · Adventure · Family Friendly