Games like Phantom Ten
Games like Phantom Ten include Outlast, Firewatch, Resident Evil 7 Biohazard, Mouthwashing, and Resident Evil Village. We matched them by the tags players give Phantom Ten on Steam (Horror, Atmospheric, Walking Simulator, Casual, and First-Person): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: Horror · Atmospheric · First-Person

Firewatch
Shared: Atmospheric · Walking Simulator · First-Person

Resident Evil 7 Biohazard
Shared: Horror · First-Person · Atmospheric

Mouthwashing
Shared: Horror · Atmospheric · Walking Simulator

Resident Evil Village
Shared: Horror · First-Person · Singleplayer

MiSide
Shared: Horror · First-Person · Atmospheric

Layers of Fear (2016)
Shared: Horror · Atmospheric · Walking Simulator

Ready or Not
Shared: Horror · Singleplayer · FPS

Outlast 2
Shared: Horror · First-Person · Atmospheric

METRO 2033 Redux
Shared: Atmospheric · Horror · FPS

Garten of Banban
Shared: Horror · First-Person · Singleplayer

Welcome to Kowloon
Shared: Horror · Atmospheric · Walking Simulator

Summer of '58
Shared: Horror · Atmospheric · Walking Simulator

No, I'm not a Human
Shared: Horror · Atmospheric · Singleplayer

Metro Exodus
Shared: Atmospheric · Horror · Singleplayer

Poppy Playtime
Shared: Horror · Singleplayer · First-Person

Scorn
Shared: Horror · Atmospheric · First-Person

Fears to Fathom - Ironbark Lookout
Shared: Horror · Atmospheric · First-Person

Still Wakes the Deep
Shared: Horror · Walking Simulator · First-Person

The Hat Man: Shadow Ward
Shared: Horror · Atmospheric · First-Person

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

Trepang2
Shared: Horror · Singleplayer · First-Person

SOMA
Shared: Horror · Atmospheric · First-Person

METRO Last Light Redux
Shared: Atmospheric · Horror · FPS