Games like Motte Island
Games like Motte Island include DISTRAINT: Deluxe Edition, Cookie Clicker, That's not my Neighbor, The Coma 2: Vicious Sisters, and Escape the Backrooms. We matched them by the tags players give Motte Island on Steam (Indie, Adventure, Horror, Casual, and 2D): closest matches first, and among equally close ones the better-known games.

DISTRAINT: Deluxe Edition
Shared: Indie · Horror · Adventure

Cookie Clicker
Shared: Horror · Indie · Casual

That's not my Neighbor
Shared: Adventure · Casual · Indie

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

Escape the Backrooms
Shared: Horror · Survival Horror · Adventure

Look Outside
Shared: Horror · Adventure · Survival Horror

LIMBO
Shared: Indie · Adventure · 2D

Pikuniku
Shared: Indie · Adventure · Casual

The Witch's House MV
Shared: Horror · Indie · 2D

Little Nightmares
Shared: Horror · Adventure · Indie

Five Nights at Freddy's: Into the Pit
Shared: Horror · Adventure · 2D

Notes of Soul
Shared: Horror · Adventure · Indie

The Forest
Shared: Horror · Adventure · Survival Horror

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

Poppy Playtime
Shared: Horror · Survival Horror · Indie

Mad Father
Shared: Horror · 2D · Adventure

There Is No Game: Wrong Dimension
Shared: Indie · Adventure · Casual

The Beast Inside
Shared: Adventure · Horror · Indie

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

Melvor Idle
Shared: Indie · Casual · Adventure

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

Outlast
Shared: Horror · Survival Horror · Adventure

Five Nights at Freddy's: Security Breach
Shared: Horror · Survival Horror · Adventure

DreadOut
Shared: Indie · Horror · Adventure