Games like Keys
Games like Keys include No, I'm not a Human, MiSide, Mouthwashing, Firewatch, and Firework. We matched them by the tags players give Keys on Steam (Indie, Horror, Comedy, Story Rich, and Thriller): closest matches first, and among equally close ones the better-known games.

No, I'm not a Human
Shared: Horror · Indie · Story Rich

MiSide
Shared: Story Rich · Horror · Singleplayer

Mouthwashing
Shared: Horror · Story Rich · Indie

Firewatch
Shared: Story Rich · Indie · Singleplayer

Firework
Shared: Indie · Horror · Singleplayer

Undertale
Shared: Story Rich · Indie · Singleplayer

Sally Face - Episode One
Shared: Indie · Story Rich · Horror

Little Nightmares
Shared: Horror · Indie · Singleplayer

Five Nights at Freddy's: Security Breach
Shared: Horror · Singleplayer · Indie

Little Nightmares II
Shared: Horror · Singleplayer · Story Rich

INSIDE
Shared: Horror · Indie · Story Rich

Poppy Playtime
Shared: Horror · Singleplayer · Indie

Unheard - Voices of Crime
Shared: Thriller · Indie · Story Rich

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

Getting Over It with Bennett Foddy
Shared: Horror · Singleplayer · Indie

DELTARUNE
Shared: Story Rich · Singleplayer · Comedy

Bendy and the Ink Machine
Shared: Horror · Singleplayer · Indie

The Last of Us™ Part I
Shared: Horror · Story Rich · Singleplayer

Lobotomy Corporation | Monster Management Simulation
Shared: Story Rich · Horror · Indie

Alan Wake
Shared: Horror · Story Rich · Thriller

Detention
Shared: Indie · Horror · Story Rich

Fran Bow
Shared: Story Rich · Horror · Indie

The Stanley Parable
Shared: Indie · Comedy · Singleplayer

Five Nights at Freddy's 2
Shared: Horror · Singleplayer · Indie