Games like Poly Ego
Games like Poly Ego include Portal 2, Portal, Planet of Lana, Defy Gravity Extended, and LIMBO. We matched them by the tags players give Poly Ego on Steam (Puzzle Platformer, Sci-fi, Platformer, Action, and Puzzle): closest matches first, and among equally close ones the better-known games.

Portal 2
Shared: Platformer · Puzzle · Puzzle Platformer

Portal
Shared: Puzzle Platformer · Puzzle · Sci-fi

Planet of Lana
Shared: Puzzle Platformer · Action · Puzzle

Defy Gravity Extended
Shared: Puzzle Platformer · Platformer · Puzzle

LIMBO
Shared: Puzzle Platformer · Platformer · Puzzle

ANIMAL WELL
Shared: Puzzle Platformer · Puzzle · Platformer

Trine 2: Complete Story
Shared: Puzzle Platformer · Platformer · Puzzle

Monument Valley 2
Shared: Action · Puzzle · Strategy

Unravel
Shared: Action · Puzzle · Platformer

The Swapper
Shared: Sci-fi · Puzzle Platformer · Puzzle

MO:Astray
Shared: Action · Puzzle Platformer · Platformer

Human Fall Flat
Shared: Puzzle · Puzzle Platformer · Action

Oddworld: New 'n' Tasty
Shared: Puzzle Platformer · Platformer · Puzzle

FAR: Changing Tides
Shared: Puzzle Platformer · Platformer · Atmospheric

Life Goes On: Done to Death
Shared: Platformer · Puzzle · Puzzle Platformer

Braid
Shared: Puzzle Platformer · Puzzle · Platformer

Moss VR
Shared: VR · Puzzle · Puzzle Platformer

Out There Somewhere
Shared: Platformer · Puzzle · Sci-fi

Seen
Shared: Puzzle · Platformer · Puzzle Platformer

Moonleap
Shared: Puzzle Platformer · Platformer · Puzzle

The Pedestrian
Shared: Puzzle Platformer · Puzzle · Platformer

Little Nightmares
Shared: Puzzle Platformer · Atmospheric · Puzzle

PICO PARK
Shared: Puzzle Platformer · Platformer · Puzzle

Ori and the Will of the Wisps
Shared: Platformer · Action · Atmospheric