Games like A Night at the Watermill
Games like A Night at the Watermill include Tiny Bunny, Detention, Sally Face - Episode One, Fran Bow, and The Cat Lady. We matched them by the tags players give A Night at the Watermill on Steam (Point & Click, Female Protagonist, Dark, Visual Novel, and Interactive Fiction): closest matches first, and among equally close ones the better-known games.

Tiny Bunny
Shared: Visual Novel · Dark · Atmospheric

Detention
Shared: Point & Click · Atmospheric · Horror

Sally Face - Episode One
Shared: Dark · Point & Click · Horror

Fran Bow
Shared: Point & Click · Dark · Psychological Horror

The Cat Lady
Shared: Female Protagonist · Point & Click · Dark

Little Misfortune
Shared: Point & Click · Female Protagonist · Psychological Horror

Dagon: by H. P. Lovecraft
Shared: Visual Novel · Atmospheric · Dark

Slay the Princess — The Pristine Cut
Shared: Visual Novel · Point & Click · Hand-drawn

What Remains of Edith Finch
Shared: Atmospheric · Female Protagonist · Exploration

The Excavation of Hob's Barrow
Shared: Point & Click · Female Protagonist · Dark

The Coffin of Andy and Leyley
Shared: Visual Novel · Dark · Female Protagonist

Looking Up I See Only A Ceiling
Shared: Point & Click · Female Protagonist · Atmospheric

Hellblade: Senua's Sacrifice
Shared: Female Protagonist · Atmospheric · Dark

Homicipher
Shared: Female Protagonist · Visual Novel · Atmospheric

OPUS: Echo of Starsong - Full Bloom Edition
Shared: Visual Novel · Female Protagonist · Interactive Fiction

Endacopia
Shared: Point & Click · Dark · Adventure

The Hungry Lamb: Traveling in the Late Ming Dynasty
Shared: Visual Novel · Interactive Fiction · Dark

SOMA
Shared: Dark · Atmospheric · Horror

No Case Should Remain Unsolved
Shared: Point & Click · Visual Novel · Interactive Fiction

Your Turn To Die -Death Game By Majority-
Shared: Female Protagonist · Dark · Point & Click

Little Nightmares
Shared: Dark · Atmospheric · Horror

Rusty Lake Paradise
Shared: Point & Click · Atmospheric · Adventure

GRIS
Shared: Female Protagonist · Atmospheric · Hand-drawn

Little Nightmares II
Shared: Dark · Horror · Atmospheric