Games like The Aching
Games like The Aching include ANIMAL WELL, Endacopia, Five Nights at Freddy's: Into the Pit, Outer Wilds, and Ib. We matched them by the tags players give The Aching on Steam (Interactive Fiction, Horror, Surreal, Exploration, and Dark Fantasy): closest matches first, and among equally close ones the better-known games.

ANIMAL WELL
Shared: Exploration · Horror · Pixel Graphics

Endacopia
Shared: Horror · Surreal · Adventure

Five Nights at Freddy's: Into the Pit
Shared: Horror · Pixel Graphics · Exploration

Outer Wilds
Shared: Exploration · Adventure · Mystery

Ib
Shared: Horror · Pixel Graphics · Exploration

Firewatch
Shared: Adventure · Exploration · Atmospheric

Killer Frequency
Shared: Horror · Interactive Fiction · Adventure

OneShot
Shared: Pixel Graphics · Adventure · Atmospheric

OMORI
Shared: Pixel Graphics · Horror · Indie

Mouthwashing
Shared: Horror · Retro · Surreal

Amnesia: A Machine For Pigs
Shared: Horror · Interactive Fiction · Exploration

CARIMARA: Beneath the forlorn limbs
Shared: Exploration · Horror · Adventure

DARK SOULS™ III
Shared: Dark Fantasy · Exploration · Lore-Rich

Buddy Simulator 1984
Shared: Horror · Retro · Pixel Graphics

Milk inside a bag of milk inside a bag of milk
Shared: Horror · Interactive Fiction · Adventure

Look Outside
Shared: Horror · Pixel Graphics · Adventure

Home
Shared: Horror · Adventure · Pixel Graphics

Mad Father
Shared: Horror · Exploration · Pixel Graphics

Bramble: The Mountain King
Shared: Horror · Adventure · Dark Fantasy

No one lives under the lighthouse Director's cut
Shared: Horror · Adventure · Retro

To the Moon
Shared: Interactive Fiction · Pixel Graphics · Adventure

The Excavation of Hob's Barrow
Shared: Horror · Adventure · Pixel Graphics

FAITH: The Unholy Trinity
Shared: Horror · Pixel Graphics · Retro

Notch - The Innocent LunA: Eclipsed SinnerS
Shared: Horror · Surreal · Lore-Rich