Games like Part-Time Adventure
Games like Part-Time Adventure include Five Nights at Freddy's: Security Breach, Firewatch, Bendy and the Dark Revival, MiSide, and A Story About My Uncle. We matched them by the tags players give Part-Time Adventure on Steam (Adventure, Casual, First-Person, Multiple Endings, and Story Rich): closest matches first, and among equally close ones the better-known games.

Five Nights at Freddy's: Security Breach
Shared: Horror · First-Person · Multiple Endings

Firewatch
Shared: Adventure · Story Rich · First-Person

Bendy and the Dark Revival
Shared: First-Person · Adventure · Horror

MiSide
Shared: Story Rich · First-Person · Horror

A Story About My Uncle
Shared: Adventure · First-Person · Story Rich

Hello Neighbor
Shared: First-Person · Horror · Story Rich

Portal 2
Shared: First-Person · Story Rich · Singleplayer

No, I'm not a Human
Shared: Horror · Story Rich · Multiple Endings

Amnesia: Rebirth
Shared: First-Person · Adventure · Story Rich

Layers of Fear (2016)
Shared: Horror · First-Person · Adventure

Dishonored
Shared: First-Person · Adventure · Story Rich

That's not my Neighbor
Shared: Adventure · Casual · Horror

Little Nightmares II
Shared: Adventure · Horror · Singleplayer

Five Nights at Freddy's: Secret of the Mimic
Shared: Adventure · First-Person · Horror

Escape the Backrooms
Shared: Horror · First-Person · Adventure

Hogwarts Legacy
Shared: Adventure · Magic · Singleplayer

The Beast Inside
Shared: Adventure · First-Person · Horror

INSIDE
Shared: Story Rich · Horror · Adventure

The Death | Thần Trùng
Shared: Adventure · Horror · Casual

Indiana Jones and the Great Circle
Shared: First-Person · Adventure · Story Rich

Resident Evil Requiem
Shared: Horror · First-Person · Adventure

Road 96
Shared: First-Person · Adventure · Story Rich

Poppy Playtime
Shared: Horror · First-Person · Singleplayer

What Remains of Edith Finch
Shared: Story Rich · First-Person · Adventure