Games like MightyIronBall
Games like MightyIronBall include Minimalism, Skul: The Hero Slayer, Broforce, Pikuniku, and Super Fancy Pants Adventure. We matched them by the tags players give MightyIronBall on Steam (Action, Indie, Casual, and Platformer): closest matches first, and among equally close ones the better-known games.

Minimalism
Shared: Indie · Action · Casual

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

Broforce
Shared: Action · Platformer · Indie

Pikuniku
Shared: Indie · Casual · Action

Super Fancy Pants Adventure
Shared: Action · Indie · Platformer

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

Katana ZERO
Shared: Action · Platformer · Indie

Defy Gravity Extended
Shared: Indie · Platformer · Action

Gensokyo Night Festival
Shared: Action · Indie · Casual

BEEP
Shared: Indie · Platformer · Action

Rogue Legacy
Shared: Indie · Platformer · Action

SpeedRunners
Shared: Indie · Action · Platformer

No Time To Explain Remastered
Shared: Action · Indie · Casual

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

Shio
Shared: Action · Indie · Casual

My Friend Pedro
Shared: Action · Indie · Platformer

Hollow Knight
Shared: Platformer · Indie · Action

Move or Die
Shared: Action · Indie · Platformer

Timberman
Shared: Casual · Indie · Action

Deadlight
Shared: Action · Indie · Platformer

Brawlhalla
Shared: Casual · Platformer · Action

Beyond Gravity
Shared: Action · Casual · Indie

Rogue Legacy 2
Shared: Action · Platformer · Indie

Witch It
Shared: Casual · Indie · Action