Games like Cardsharp
Games like Cardsharp include Buckshot Roulette, Outlast, Phasmophobia, No, I'm not a Human, and CloverPit. We matched them by the tags players give Cardsharp on Steam (First-Person, Multiplayer, Retro, Horror, and Dark): closest matches first, and among equally close ones the better-known games.

Buckshot Roulette
Shared: Multiplayer · First-Person · Dark

Outlast
Shared: First-Person · Horror · Multiplayer

Phasmophobia
Shared: Multiplayer · Horror · First-Person

No, I'm not a Human
Shared: Horror · Choices Matter · First-Person

CloverPit
Shared: First-Person · Roguelike · Horror

The Outlast Trials
Shared: Multiplayer · Horror · First-Person

Outlast 2
Shared: First-Person · Horror · Dark

Escape the Backrooms
Shared: Multiplayer · Horror · First-Person

Pacify
Shared: Multiplayer · Horror · First-Person

Dead by Daylight
Shared: Multiplayer · Horror · First-Person

Inscryption
Shared: Horror · Card Game · Dark

Slender: The Arrival
Shared: First-Person · Horror · Multiplayer

DEVOUR
Shared: Multiplayer · Horror · First-Person

Poppy Playtime
Shared: Horror · First-Person · Dark

Dark Deception
Shared: Multiplayer · Horror · First-Person

Grand Theft Auto V Legacy
Shared: Multiplayer · First-Person · Action

R.E.P.O.
Shared: Multiplayer · Horror · First-Person

Ultimate Custom Night
Shared: Horror · First-Person · Singleplayer

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

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

Visage
Shared: Horror · Multiplayer · First-Person

Ready or Not
Shared: Multiplayer · First-Person · Horror

Shift At Midnight
Shared: Multiplayer · Horror · Retro

Slay the Spire 2
Shared: Roguelike · Multiplayer · Card Game