Games like Cupcake: an Apartment Adventure
Games like Cupcake: an Apartment Adventure include Costume Quest, Donut County, Slime Rancher, South Park™: The Stick of Truth™, and Undertale. We matched them by the tags players give Cupcake: an Apartment Adventure on Steam (Adventure, RPG, Indie, Casual, and Comedy): closest matches first, and among equally close ones the better-known games.

Costume Quest
Shared: Adventure · RPG · Casual

Donut County
Shared: Indie · Casual · Funny

Slime Rancher
Shared: Adventure · Singleplayer · Cute

South Park™: The Stick of Truth™
Shared: RPG · Adventure · Comedy

Undertale
Shared: RPG · Funny · Indie

There Is No Game: Wrong Dimension
Shared: Indie · Adventure · Funny

Thank Goodness You're Here!
Shared: Adventure · Comedy · Funny

West of Loathing
Shared: RPG · Adventure · Comedy

Evoland
Shared: RPG · Adventure · Indie

The Stanley Parable
Shared: Indie · Comedy · Adventure

Little Inferno
Shared: Indie · Casual · Funny

To the Moon
Shared: Indie · Adventure · RPG

Cat Quest
Shared: Adventure · RPG · Indie

Jazzpunk: Director's Cut
Shared: Indie · Adventure · Comedy

Melvor Idle
Shared: RPG · Indie · Casual

Say No! More
Shared: Indie · Comedy · Funny

Pikuniku
Shared: Adventure · Indie · Casual

Florence
Shared: Adventure · Indie · Casual

Otaku's Adventure
Shared: Funny · Indie · RPG

Chicory: A Colorful Tale
Shared: Adventure · Indie · RPG

South Park™: The Fractured But Whole™
Shared: RPG · Comedy · Funny

Nexomon: Extinction
Shared: RPG · Casual · Adventure

Firewatch
Shared: Adventure · Indie · Singleplayer

The Henry Stickmin Collection
Shared: Funny · Comedy · Singleplayer