Games like IRON SOL
Games like IRON SOL include Rain World, Hollow Knight, Celeste, Hollow Knight: Silksong, and SANABI. We matched them by the tags players give IRON SOL on Steam (Platformer, Difficult, Pixel Graphics, Exploration, and 2D Platformer): closest matches first, and among equally close ones the better-known games.

Rain World
Shared: Difficult · Exploration · Platformer

Hollow Knight
Shared: Platformer · Difficult · Exploration

Celeste
Shared: Difficult · Pixel Graphics · Platformer

Hollow Knight: Silksong
Shared: Difficult · Platformer · Exploration

SANABI
Shared: Pixel Graphics · 2D Platformer · Adventure

Super Meat Boy
Shared: Platformer · Difficult · Pixel Graphics

Hyper Light Drifter
Shared: Pixel Graphics · Difficult · Atmospheric

VVVVVV
Shared: Platformer · Pixel Graphics · Difficult

Momodora: Reverie Under The Moonlight
Shared: Pixel Graphics · 2D Platformer · Exploration

Fallout 4
Shared: Exploration · Post-apocalyptic · Adventure

Katana ZERO
Shared: Pixel Graphics · Platformer · 2D Platformer

ANIMAL WELL
Shared: Exploration · Pixel Graphics · Platformer

Haiku, the Robot
Shared: Pixel Graphics · Exploration · Platformer

Jump King
Shared: Difficult · Pixel Graphics · Platformer

Reventure
Shared: Pixel Graphics · Platformer · Adventure

Shovel Knight: Treasure Trove
Shared: Platformer · Pixel Graphics · Difficult

Ori and the Will of the Wisps
Shared: Platformer · Adventure · Exploration

Webbed
Shared: Pixel Graphics · 2D Platformer · Platformer

Axiom Verge
Shared: Platformer · Pixel Graphics · Exploration

Pizza Tower
Shared: 2D Platformer · Platformer · Pixel Graphics

The End Is Nigh
Shared: Platformer · Difficult · Adventure

Cave Story+
Shared: Difficult · Platformer · Exploration

Terraria
Shared: Pixel Graphics · Adventure · Exploration

Blasphemous 2
Shared: Difficult · Pixel Graphics · Adventure