Games like Heliophobia
Games like Heliophobia include Little Nightmares, Outlast, Little Nightmares II, Hellblade: Senua's Sacrifice, and Fran Bow. We matched them by the tags players give Heliophobia on Steam (Indie, Action, Adventure, Horror, and Surreal): closest matches first, and among equally close ones the better-known games.

Little Nightmares
Shared: Horror · Adventure · Atmospheric

Outlast
Shared: Horror · Atmospheric · Singleplayer

Little Nightmares II
Shared: Adventure · Horror · Singleplayer

Hellblade: Senua's Sacrifice
Shared: Atmospheric · Adventure · Singleplayer

Fran Bow
Shared: Indie · Horror · Adventure

DreadOut
Shared: Indie · Horror · Adventure

Poppy Playtime
Shared: Horror · Singleplayer · Indie

The Beast Inside
Shared: Adventure · Horror · Action

Tomb Raider Game of the Year
Shared: Action · Adventure · Singleplayer

Detention
Shared: Indie · Horror · Adventure

The Hat Man: Shadow Ward
Shared: Indie · Horror · Adventure

The Coma 2: Vicious Sisters
Shared: Indie · Adventure · Horror

[Chillas Art] The Convenience Store
Shared: Indie · Horror · Adventure

We Happy Few
Shared: Adventure · Action · Indie

The Cat Lady
Shared: Horror · Adventure · Indie

LIMBO
Shared: Indie · Adventure · Atmospheric

IMSCARED
Shared: Indie · Horror · Adventure

Rise of the Tomb Raider™
Shared: Action · Adventure · Singleplayer

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

Mouthwashing
Shared: Horror · Indie · Psychological Horror

Sally Face - Episode One
Shared: Indie · Horror · Adventure

Alan Wake
Shared: Action · Horror · Adventure

Spooky's Jump Scare Mansion: HD Renovation
Shared: Indie · Horror · Adventure

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