I like Paleo Pines myself. It’s like Stardew and Animal Crossing had a baby about dinosaurs. It’s absolutely adorable.

Chao Resort Island. A fan game that’s basically a 2D/3D Chao Garden from SA2. It uses some sprites from the old Sonic Advance games, but it’s just a fun little virtual caregiver thing.

Sonic Adventure 2 Battle: Chao Garden. The “true” Chao Garden experience according to fans online. I have the steam version so I have the popular Extended Chao World mods to make it better/easier to raise Chao.

A lot of survival crafting games (base building and decorating and such) can be cozy too, if you want them to be.