Games like Motel Nightmares
Games like Motel Nightmares include Portal 2, Supraland, Inside the Backrooms, Little Nightmares, and Little Nightmares II. We matched them by the tags players give Motel Nightmares on Steam (Adventure, Puzzle, Platformer, Exploration, and FPS): closest matches first, and among equally close ones the better-known games.

Portal 2
Shared: Puzzle · Platformer · First-Person

Supraland
Shared: Adventure · Exploration · Puzzle Platformer

Inside the Backrooms
Shared: Puzzle · Adventure · Horror

Little Nightmares
Shared: Adventure · Puzzle · Puzzle Platformer

Little Nightmares II
Shared: Adventure · Puzzle · Horror

LIMBO
Shared: Puzzle · Platformer · Puzzle Platformer

ANIMAL WELL
Shared: Puzzle · Exploration · Platformer

PEAK
Shared: Adventure · Exploration · First-Person

Outer Wilds
Shared: Exploration · Adventure · Puzzle

The Exit 8
Shared: Puzzle · Exploration · Horror

Portal
Shared: Puzzle · Puzzle Platformer · First-Person

COCOON
Shared: Adventure · Puzzle · Exploration

Viewfinder
Shared: Puzzle · Puzzle Platformer · Adventure

The Talos Principle 2
Shared: Puzzle · Exploration · Puzzle Platformer

FEZ
Shared: Puzzle · Platformer · Exploration

Murders on the Yangtze River
Shared: Puzzle · Adventure · Exploration

Ready or Not
Shared: FPS · Realistic · Adventure

Superliminal
Shared: Puzzle · First-Person · Adventure

Riven
Shared: Adventure · Puzzle · Exploration

Poppy Playtime
Shared: Puzzle · Horror · First-Person

Escape the Backrooms
Shared: Adventure · Horror · Exploration

MiSide
Shared: First-Person · 3D · Psychological Horror

Supraland Six Inches Under
Shared: Adventure · Exploration · Puzzle Platformer

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