Games like ALEON's Nightmare 2
Games like ALEON's Nightmare 2 include Resident Evil Requiem, Outlast, SILENT HILL f, SOMA, and The Outlast Trials. We matched them by the tags players give ALEON's Nightmare 2 on Steam (Horror, Psychological Horror, Action, Dark, and Psychological): closest matches first, and among equally close ones the better-known games.

Resident Evil Requiem
Shared: Horror · Action · Survival Horror

Outlast
Shared: Horror · Psychological Horror · Survival Horror

SILENT HILL f
Shared: Horror · Psychological Horror · Female Protagonist

SOMA
Shared: Horror · Psychological Horror · Dark

The Outlast Trials
Shared: Horror · Psychological Horror · Action

Hellblade: Senua's Sacrifice
Shared: Psychological · Female Protagonist · Horror

Buckshot Roulette
Shared: Horror · Dark · Psychological

Outlast 2
Shared: Horror · Psychological Horror · Dark

Poppy Playtime
Shared: Horror · Psychological Horror · Dark

Slender: The Arrival
Shared: Horror · Psychological Horror · Dark

Mouthwashing
Shared: Horror · Psychological Horror · Psychological

Darkwood
Shared: Horror · Psychological Horror · Action

Resident Evil Village
Shared: Horror · Action · Survival Horror

Escape the Backrooms
Shared: Horror · Psychological Horror · Survival Horror

Visage
Shared: Horror · Psychological Horror · Dark

Lethal Company
Shared: Horror · Psychological Horror · Survival Horror

Inside the Backrooms
Shared: Horror · Psychological Horror · Survival Horror

SILENT HILL: Townfall
Shared: Horror · Action · Psychological Horror

Garten of Banban
Shared: Horror · Psychological Horror · Dark

Phasmophobia
Shared: Horror · Psychological Horror · Dark

Hellblade II: Senua’s Saga
Shared: Psychological Horror · Female Protagonist · Dark

Choo-Choo Charles
Shared: Horror · Dark · Survival Horror

Pacify
Shared: Horror · Psychological Horror · Dark

Alien: Isolation
Shared: Horror · Survival Horror · Female Protagonist