Games like Alphabet
Games like Alphabet include Clustertruck, Neon White, Portal 2, Getting Over It with Bennett Foddy, and A Story About My Uncle. We matched them by the tags players give Alphabet on Steam (Physics, Action, Indie, 3D Platformer, and Casual): closest matches first, and among equally close ones the better-known games.

Clustertruck
Shared: Action · Physics · 3D Platformer

Neon White
Shared: 3D Platformer · Action · Platformer

Portal 2
Shared: Platformer · Singleplayer · 3D Platformer

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

A Story About My Uncle
Shared: Indie · Parkour · Platformer

ALTF4
Shared: Physics · 3D Platformer · Action

Portal
Shared: 3D Platformer · Physics · Singleplayer

Gorilla Tag
Shared: Action · Parkour · 3D Platformer

Garry's Mod
Shared: Physics · Casual · Singleplayer

Tiny and Big: Grandpas Leftovers
Shared: Physics · Indie · Platformer

Pseudoregalia
Shared: 3D Platformer · Parkour · Platformer

My Friend Pedro
Shared: Action · Indie · Parkour

Refunct
Shared: 3D Platformer · Parkour · Casual

Gang Beasts
Shared: Action · Physics · Casual

BEEP
Shared: Indie · Physics · Platformer

Cyber Hook
Shared: Indie · 3D Platformer · Action

Pumpkin Jack
Shared: Action · 3D Platformer · Indie

ScooterFlow
Shared: Indie · Physics · 3D Platformer

Haste
Shared: 3D Platformer · Action · Parkour

VHOLUME
Shared: 3D Platformer · Parkour · Platformer

Crumble
Shared: 3D Platformer · Indie · Action

Marvel’s Spider-Man Remastered
Shared: Action · Singleplayer · Parkour

Goat Simulator
Shared: Physics · Indie · Action

Kao the Kangaroo: Round 2 (2003 re-release)
Shared: Action · 3D Platformer · Casual