Games like Alpha and Iota
Games like Alpha and Iota include Celeste, Viewfinder, Portal 2, Brothers - A Tale of Two Sons, and LIMBO. We matched them by the tags players give Alpha and Iota on Steam (Puzzle Platformer, Precision Platformer, Emotional, Abstract, and Psychological): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Precision Platformer · Platformer · Indie

Viewfinder
Shared: Puzzle Platformer · Abstract · Puzzle

Portal 2
Shared: Puzzle Platformer · Puzzle · Story Rich

Brothers - A Tale of Two Sons
Shared: Emotional · Story Rich · Controller

LIMBO
Shared: Puzzle Platformer · Puzzle · Indie

INSIDE
Shared: Puzzle Platformer · Story Rich · Indie

Planet of Lana
Shared: Puzzle Platformer · Puzzle · Emotional

To the Moon
Shared: Emotional · Story Rich · Indie

Braid
Shared: Puzzle Platformer · Puzzle · Platformer

Super Meat Boy
Shared: Precision Platformer · Platformer · Indie

The Last Campfire
Shared: Emotional · Puzzle · Story Rich

Little Nightmares
Shared: Puzzle Platformer · Story Rich · Puzzle

Papo & Yo
Shared: Puzzle Platformer · Emotional · Puzzle

Neva
Shared: Emotional · Platformer · Indie

The Beginner's Guide
Shared: Story Rich · Abstract · Indie

INMOST
Shared: Puzzle Platformer · Story Rich · Psychological

Thomas Was Alone
Shared: Precision Platformer · Puzzle Platformer · Platformer

Finding Paradise
Shared: Emotional · Story Rich · Psychological

Leap Year
Shared: Precision Platformer · Puzzle Platformer · Puzzle

Portal
Shared: Puzzle Platformer · Puzzle · Story Rich

Before Your Eyes
Shared: Emotional · Story Rich · Indie

A Space for the Unbound
Shared: Emotional · Story Rich · Psychological

Seen
Shared: Puzzle Platformer · Indie · Puzzle

SANABI
Shared: Story Rich · 2D Platformer · Indie