Games like Little Aviary
Games like Little Aviary include Chillquarium, Cookie Clicker, Tiny Pasture, Spirit City: Lofi Sessions, and Cast n Chill. We matched them by the tags players give Little Aviary on Steam (Idler, Creature Collector, Desktop Companion, Cozy, and Incremental): closest matches first, and among equally close ones the better-known games.

Chillquarium
Shared: Creature Collector · Idler · Collectathon

Cookie Clicker
Shared: Idler · Incremental · Casual

Tiny Pasture
Shared: Idler · Incremental · Creature Collector

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

Cast n Chill
Shared: Idler · Creature Collector · Cozy

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

Cornerpond
Shared: Idler · Desktop Companion · Incremental

How to Train Your Cock
Shared: Idler · Desktop Companion · Cozy

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

Digseum
Shared: Idler · Incremental · Casual

Birdwatching Notebook
Shared: Idler · Creature Collector · Desktop Companion

Keep on Mining!
Shared: Idler · Incremental · Relaxing

Rusty's Retirement
Shared: Idler · Desktop Companion · Relaxing

Shelldiver
Shared: Incremental · Idler · Casual

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

Nodebuster
Shared: Idler · Incremental · Casual

Mushroom Nook
Shared: Idler · Desktop Companion · Creature Collector

Click the Button
Shared: Idler · Incremental · Casual

Joyquarium
Shared: Idler · Creature Collector · Incremental

Plantera
Shared: Idler · Incremental · Collectathon

Chonkers
Shared: Creature Collector · Idler · Cozy

Bugtopia
Shared: Idler · Creature Collector · Incremental

Fortune Mill
Shared: Idler · Incremental · Casual

Croakoloco
Shared: Creature Collector · Idler · Incremental