Games like The Purge Day
Games like The Purge Day include Phasmophobia, Resident Evil Village, Resident Evil 7 Biohazard, GORN, and Trepang2. We matched them by the tags players give The Purge Day on Steam (Indie, Action, Violent, Horror, and Aliens): closest matches first, and among equally close ones the better-known games.

Phasmophobia
Shared: Horror · VR · Dark

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

Resident Evil 7 Biohazard
Shared: Horror · VR · Action

GORN
Shared: Action · VR · Violent

Trepang2
Shared: Horror · Violent · Action

Buckshot Roulette
Shared: Horror · Indie · Dark

DOOM Eternal
Shared: Action · Violent · Demons

Hard Bullet
Shared: Action · VR · Violent

FIVE NIGHTS AT FREDDY'S: HELP WANTED
Shared: Horror · VR · Action

My Friend Pedro
Shared: Indie · Action · Violent

SUPERHOT
Shared: Action · Indie · Bullet Time

Half-Life: Alyx
Shared: VR · Horror · Action

Resident Evil 4
Shared: Action · Horror · Dark

Bendy and the Dark Revival
Shared: Horror · Action · Indie

Granny
Shared: Horror · Indie · VR

Outlast 2
Shared: Horror · Violent · Dark

Contractors
Shared: Action · Violent · Indie

Hotline Miami
Shared: Action · Violent · Indie

Bendy and the Ink Machine
Shared: Horror · Indie · First-Person

The Brookhaven Experiment
Shared: Action · Indie · VR

Granny: Chapter Two
Shared: Indie · Horror · Violent

Serious Sam Fusion 2017 (beta)
Shared: Action · Indie · Violent

BONEWORKS
Shared: Action · VR · Violent

Blood Trail
Shared: Violent · Action · VR