Games like Splice
Games like Splice include Five Nights at Freddy's: Security Breach, Outlast, The Forest, Alien: Isolation, and SOMA. We matched them by the tags players give Splice on Steam (Horror, Stealth, Adventure, Multiple Endings, and First-Person): closest matches first, and among equally close ones the better-known games.

Five Nights at Freddy's: Security Breach
Shared: Horror · Stealth · First-Person

Outlast
Shared: Horror · First-Person · Atmospheric

The Forest
Shared: Horror · Adventure · First-Person

Alien: Isolation
Shared: Horror · Stealth · Sci-fi

SOMA
Shared: Horror · Atmospheric · Sci-fi

Five Nights at Freddy's: Secret of the Mimic
Shared: Horror · Adventure · First-Person

Dishonored
Shared: Stealth · First-Person · Multiple Endings

Amnesia: The Dark Descent
Shared: Horror · First-Person · Atmospheric

Little Nightmares II
Shared: Horror · Adventure · Atmospheric

Resident Evil 7 Biohazard
Shared: Horror · First-Person · Atmospheric

Little Nightmares
Shared: Horror · Adventure · Atmospheric

Lethal Company
Shared: Horror · First-Person · Sci-fi

The Talos Principle
Shared: First-Person · Puzzle · Sci-fi

Thief
Shared: Stealth · Adventure · First-Person

SchoolBoy Runaway
Shared: Adventure · Horror · Stealth

Killer Frequency
Shared: Horror · Adventure · Simulation

ROUTINE
Shared: Horror · Sci-fi · Adventure

METRO 2033 Redux
Shared: Horror · Atmospheric · Stealth

Thief Simulator
Shared: Stealth · Simulation · First-Person

Stray
Shared: Adventure · Atmospheric · Horror

METRO Last Light Redux
Shared: Horror · Atmospheric · Stealth

Crime Scene Cleaner
Shared: Simulation · First-Person · Atmospheric

Firewatch
Shared: Adventure · Atmospheric · First-Person

Amnesia: Rebirth
Shared: First-Person · Horror · Adventure