Games like Tomokin Monsters
Games like Tomokin Monsters include Slime Rancher 2, Spirit City: Lofi Sessions, Tiny Pasture, Slime Rancher, and MyVoiceZoo. We matched them by the tags players give Tomokin Monsters on Steam (Desktop Companion, Creature Collector, Singleplayer, Casual, and 2.5D): closest matches first, and among equally close ones the better-known games.

Slime Rancher 2
Shared: Singleplayer · Creature Collector · Cute

Spirit City: Lofi Sessions
Shared: Desktop Companion · Creature Collector · Idler

Tiny Pasture
Shared: Idler · Creature Collector · Casual

Slime Rancher
Shared: Singleplayer · Cute · Casual

MyVoiceZoo
Shared: Creature Collector · Casual · Sandbox

Fish to Dish: Idle Sushi
Shared: Desktop Companion · Creature Collector · Idler

Townscaper
Shared: Casual · Sandbox · Singleplayer

Birdwatching Notebook
Shared: Creature Collector · Desktop Companion · Idler

Mushroom Nook
Shared: Desktop Companion · Creature Collector · Casual

Cast n Chill
Shared: Creature Collector · Idler · Desktop Companion

Maltese's Fluffy Onsen
Shared: Desktop Companion · Casual · Idler

Ithya: Magic Studies
Shared: Desktop Companion · Idler · Casual

Unpacking
Shared: Casual · Singleplayer · Cute

A Little to the Left
Shared: Casual · Singleplayer · Relaxing

Cornerpond
Shared: Desktop Companion · Creature Collector · Idler

Bloons TD 6
Shared: Singleplayer · Casual · Sandbox

WEBFISHING
Shared: Casual · Creature Collector · Cute

Bugsnax
Shared: Creature Collector · Singleplayer · Cute

Fischer's Fishing Journey
Shared: Creature Collector · Idler · Casual

Is This Seat Taken?
Shared: Casual · Singleplayer · Cute

Koi Farm
Shared: Creature Collector · Casual · 2.5D

Ropuka's Idle Island
Shared: Desktop Companion · Idler · Casual

Melvor Idle
Shared: Casual · Idler · Singleplayer

Digseum
Shared: Casual · Idler · Relaxing