Games like Alphaman
Games like Alphaman include Shovel Knight: Treasure Trove, Broforce, The Messenger, Katana ZERO, and Skul: The Hero Slayer. We matched them by the tags players give Alphaman on Steam (Action, Indie, Platformer, and Retro): closest matches first, and among equally close ones the better-known games.

Shovel Knight: Treasure Trove
Shared: Platformer · Retro · Indie

Broforce
Shared: Action · Platformer · Indie

The Messenger
Shared: Platformer · Retro · Indie

Katana ZERO
Shared: Action · Platformer · Indie

Skul: The Hero Slayer
Shared: Action · Indie · Platformer

Angry Video Game Nerd Adventures
Shared: Indie · Action · Platformer

Dust: An Elysian Tail
Shared: Action · Platformer · Indie

Out There Somewhere
Shared: Platformer · Indie · Action

Hotline Miami
Shared: Action · Indie · Retro

Gravity Circuit
Shared: Action · Indie · Platformer

Super Meat Boy
Shared: Platformer · Indie · Retro

Axiom Verge
Shared: Indie · Platformer · Action

Freedom Planet
Shared: Action · Platformer · Indie

Cuphead
Shared: Platformer · Indie · Action

Rogue Legacy
Shared: Platformer · Indie · Action

Gato Roboto
Shared: Indie · Action · Platformer

Bloodstained: Curse of the Moon
Shared: Action · Platformer · Retro

Volgarr the Viking
Shared: Action · Platformer · Indie

SANABI
Shared: Action · Indie · Platformer

Risk of Rain (2013)
Shared: Indie · Action · Platformer

UFO 50
Shared: Indie · Action · Retro

Hollow Knight
Shared: Platformer · Indie · Action

Pizza Tower
Shared: Indie · Platformer · Action

My Friend Pedro
Shared: Action · Indie · Platformer