Games like Mothiary
Games like Mothiary include Chillquarium, Tiny Pasture, Cookie Clicker, Shelldiver, and Digseum. We matched them by the tags players give Mothiary on Steam (Creature Collector, Idler, Simulation, Relaxing, and Casual): closest matches first, and among equally close ones the better-known games.

Chillquarium
Shared: Creature Collector · Idler · Collectathon

Tiny Pasture
Shared: Idler · Creature Collector · Casual

Cookie Clicker
Shared: Idler · Incremental · Casual

Shelldiver
Shared: Casual · Idler · Incremental

Digseum
Shared: Idler · Casual · Simulation

Keep on Mining!
Shared: Idler · Relaxing · Casual

Cornerpond
Shared: Idler · Simulation · Creature Collector

Bugtopia
Shared: Idler · Creature Collector · Incremental

Budgie's Bug Shop
Shared: Simulation · Idler · Casual

Slime Rancher 2
Shared: Relaxing · Creature Collector · Simulation

Click the Button
Shared: Idler · Casual · Simulation

Nodebuster
Shared: Idler · Casual · Simulation

Joyquarium
Shared: Creature Collector · Idler · Simulation

Scritchy Scratchy
Shared: Idler · Incremental · Relaxing

Cast n Chill
Shared: Idler · Relaxing · Creature Collector

Click and Conquer
Shared: Simulation · Idler · Casual

Croakoloco
Shared: Creature Collector · Idler · Simulation

Lyca
Shared: Idler · Casual · Relaxing

Keep on Mining! - Worlds
Shared: Idler · Casual · Relaxing

A Game About Feeding A Black Hole
Shared: Relaxing · Casual · Idler

Fortune Mill
Shared: Idler · Incremental · Simulation

Fish to Dish: Idle Sushi
Shared: Idler · Creature Collector · Casual

Placid Plastic Duck Simulator
Shared: Relaxing · Casual · Collectathon

Kabuto Park
Shared: Creature Collector · Casual · Relaxing