Games like Diatribes
Games like Diatribes include Firewatch, What Remains of Edith Finch, Scanner Sombre, Riven, and CARIMARA: Beneath the forlorn limbs. We matched them by the tags players give Diatribes on Steam (Exploration, Interactive Fiction, Walking Simulator, Casual, and 3D): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Walking Simulator · Adventure · Exploration

What Remains of Edith Finch
Shared: Walking Simulator · Exploration · First-Person

Scanner Sombre
Shared: Exploration · Walking Simulator · First-Person

Riven
Shared: Exploration · Adventure · First-Person

CARIMARA: Beneath the forlorn limbs
Shared: Exploration · 3D · Adventure

Gone Home
Shared: Walking Simulator · Exploration · First-Person

Amnesia: A Machine For Pigs
Shared: Walking Simulator · Exploration · First-Person

PEAK
Shared: Exploration · Adventure · First-Person

Road 96: Mile 0
Shared: Exploration · Interactive Fiction · Walking Simulator

The Exit 8
Shared: Exploration · Walking Simulator · First-Person

Slime Rancher
Shared: Exploration · Adventure · First-Person

Dear Esther: Landmark Edition
Shared: Exploration · Walking Simulator · Interactive Fiction

The Stanley Parable
Shared: Walking Simulator · First-Person · Exploration

Before Your Eyes
Shared: Interactive Fiction · First-Person · Walking Simulator

Obduction
Shared: Exploration · Adventure · First-Person

Myst
Shared: Exploration · Adventure · First-Person

Journey
Shared: Exploration · Adventure · Walking Simulator

Kona
Shared: Exploration · First-Person · Walking Simulator

RV There Yet?
Shared: Exploration · Adventure · First-Person

Spirit of the North
Shared: Exploration · Casual · Adventure

Outer Wilds
Shared: Exploration · Adventure · Story Rich

Killer Frequency
Shared: Interactive Fiction · Adventure · Walking Simulator

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

The Witness
Shared: Exploration · First-Person · Walking Simulator