Games like OVERWHELM
Games like OVERWHELM include Hollow Knight, Hollow Knight: Silksong, Katana ZERO, Super Meat Boy, and Celeste. We matched them by the tags players give OVERWHELM on Steam (Indie, Action, Platformer, Pixel Graphics, and Difficult): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Platformer · Indie · Difficult

Hollow Knight: Silksong
Shared: Indie · Difficult · Platformer

Katana ZERO
Shared: Action · Pixel Graphics · Platformer

Super Meat Boy
Shared: Platformer · Indie · Difficult

Celeste
Shared: Indie · Pixel Graphics · Difficult

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

Hotline Miami
Shared: Action · Indie · Pixel Graphics

Skul: The Hero Slayer
Shared: Indie · Action · Pixel Graphics

Blasphemous
Shared: Pixel Graphics · Indie · 2D

Hotline Miami 2: Wrong Number
Shared: Pixel Graphics · Action · Difficult

Pizza Tower
Shared: Indie · Platformer · Pixel Graphics

The Messenger
Shared: Platformer · Pixel Graphics · Indie

The Binding of Isaac: Rebirth
Shared: Indie · Difficult · Pixel Graphics

SANABI
Shared: Action · Pixel Graphics · Indie

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

Axiom Verge
Shared: Indie · Platformer · Pixel Graphics

Cuphead
Shared: Difficult · Platformer · Indie

Geometry Dash
Shared: Difficult · 2D · Platformer

Super Crate Box
Shared: Indie · Platformer · Action

VVVVVV
Shared: Indie · Pixel Graphics · Platformer

Out There Somewhere
Shared: Indie · Platformer · Pixel Graphics

CARRION
Shared: Pixel Graphics · Action · Indie

Jump King
Shared: Indie · Difficult · Pixel Graphics

Gravity Circuit
Shared: Action · Indie · Platformer

