Games like Afterparty
Games like Afterparty include Tales from the Borderlands, Oxenfree, There Is No Game: Wrong Dimension, Sally Face - Episode One, and Firewatch. We matched them by the tags players give Afterparty on Steam (Indie, Narrative, Supernatural, Comedy, and Adventure): closest matches first, and among equally close ones the better-known games.

Tales from the Borderlands
Shared: Comedy · Adventure · Choices Matter

Oxenfree
Shared: Supernatural · Indie · Choices Matter

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

Sally Face - Episode One
Shared: Indie · Story Rich · Adventure

Firewatch
Shared: Adventure · Story Rich · Atmospheric

Little Misfortune
Shared: Indie · Adventure · Choices Matter

Dispatch
Shared: Choices Matter · Story Rich · Comedy

OneShot
Shared: Indie · Story Rich · Atmospheric

Night in the Woods
Shared: Adventure · Story Rich · Narrative

The Witcher 3: Wild Hunt — Remastered
Shared: Adventure · Story Rich · Atmospheric

Before Your Eyes
Shared: Narrative · Indie · Story Rich

Death and Taxes
Shared: Choices Matter · Story Rich · Narrative

Deponia
Shared: Comedy · Adventure · Indie

INSIDE
Shared: Indie · Atmospheric · Story Rich

Florence
Shared: Indie · Adventure · Story Rich

The Stanley Parable
Shared: Indie · Comedy · Adventure

Undertale
Shared: Choices Matter · Story Rich · Indie

Unavowed
Shared: Indie · Adventure · Supernatural

Road 96
Shared: Adventure · Choices Matter · Story Rich

The Walking Dead
Shared: Adventure · Story Rich · Choices Matter

The Henry Stickmin Collection
Shared: Comedy · Choices Matter · Indie

The Wolf Among Us
Shared: Adventure · Story Rich · Choices Matter

Esoteric Ebb
Shared: Choices Matter · Story Rich · Narrative

Broken Age
Shared: Indie · Adventure · Comedy