Games like UnderDread
Games like UnderDread include Firewatch, What Remains of Edith Finch, Outer Wilds, Layers of Fear (2016), and Amnesia: A Machine For Pigs. We matched them by the tags players give UnderDread on Steam (Adventure, Indie, Horror, Exploration, and Walking Simulator): closest matches first, and among equally close ones the better-known games.
Firewatch
Shared: Adventure · Walking Simulator · Atmospheric
What Remains of Edith Finch
Shared: Walking Simulator · Adventure · Atmospheric
Outer Wilds
Shared: Exploration · Adventure · Mystery
Layers of Fear (2016)
Shared: Horror · Walking Simulator · Atmospheric
Amnesia: A Machine For Pigs
Shared: Horror · Walking Simulator · Exploration
Mouthwashing
Shared: Horror · Indie · Atmospheric
INFRA
Shared: Exploration · Adventure · Walking Simulator
Gone Home
Shared: Indie · Walking Simulator · Exploration
The Vanishing of Ethan Carter
Shared: Mystery · Adventure · Exploration
SOMA
Shared: Horror · Atmospheric · Exploration
Journey
Shared: Adventure · Indie · Exploration
The Park®
Shared: Horror · Walking Simulator · Adventure
CARIMARA: Beneath the forlorn limbs
Shared: Adventure · Exploration · Horror
The Beginner's Guide
Shared: Indie · Walking Simulator · Adventure
The Forgotten City
Shared: Adventure · Exploration · Mystery
Sally Face - Episode One
Shared: Indie · Horror · Adventure
Lethal Company
Shared: Horror · Exploration · First-Person
Kholat
Shared: Horror · Walking Simulator · Indie
Blair Witch
Shared: Adventure · Horror · Indie
Still Wakes the Deep
Shared: Horror · Walking Simulator · Adventure
When the Darkness comes
Shared: Indie · Walking Simulator · Horror
Return of the Obra Dinn
Shared: Mystery · Indie · Atmospheric
OMORI
Shared: Indie · Story Rich · Horror
[Chillas Art] The Convenience Store
Shared: Indie · Horror · Adventure