Games like Lost Alone Ep.1 - Sorellina
Games like Lost Alone Ep.1 - Sorellina include Mouthwashing, SOMA, What Remains of Edith Finch, No, I'm not a Human, and Poppy Playtime. We matched them by the tags players give Lost Alone Ep.1 - Sorellina on Steam (Psychological Horror, Horror, Psychological, Thriller, and Mystery): closest matches first, and among equally close ones the better-known games.

Mouthwashing
Shared: Psychological Horror · Horror · Story Rich

SOMA
Shared: Psychological Horror · Horror · Story Rich

What Remains of Edith Finch
Shared: Story Rich · Mystery · Atmospheric

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

Poppy Playtime
Shared: Horror · Psychological Horror · Dark

Sally Face - Episode One
Shared: Psychological Horror · Horror · Story Rich

MiSide
Shared: Psychological Horror · Horror · Story Rich

Firewatch
Shared: Story Rich · Mystery · Atmospheric

Layers of Fear (2016)
Shared: Psychological Horror · Horror · Atmospheric

Summer of '58
Shared: Horror · Psychological Horror · Thriller

Phasmophobia
Shared: Horror · Psychological Horror · Dark

Amnesia: A Machine For Pigs
Shared: Horror · Psychological Horror · Story Rich

Outer Wilds
Shared: Mystery · Exploration · Story Rich

Buckshot Roulette
Shared: Horror · Dark · Psychological

SILENT HILL 2
Shared: Psychological Horror · Horror · Psychological

Little Nightmares II
Shared: Horror · Psychological Horror · Dark

Fran Bow
Shared: Psychological Horror · Horror · Story Rich

Inside the Backrooms
Shared: Horror · Psychological Horror · Exploration

Fears to Fathom - Ironbark Lookout
Shared: Psychological Horror · Horror · Thriller

Still Wakes the Deep
Shared: Psychological Horror · Horror · Story Rich

Detention
Shared: Horror · Psychological Horror · Story Rich

Martha Is Dead
Shared: Psychological Horror · Psychological · Horror

Alan Wake
Shared: Horror · Story Rich · Thriller

The Park®
Shared: Psychological Horror · Horror · First-Person