Games like Flem
Games like Flem include Hollow Knight, Cuphead, Hollow Knight: Silksong, Shovel Knight: Treasure Trove, and Geometry Dash. We matched them by the tags players give Flem on Steam (Action, Indie, Platformer, 2D, and Difficult): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Platformer · Difficult · Indie

Cuphead
Shared: Difficult · Platformer · 2D

Hollow Knight: Silksong
Shared: Indie · Difficult · 2D

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

Geometry Dash
Shared: Difficult · 2D · Great Soundtrack

Super Meat Boy
Shared: Platformer · Indie · Difficult

Katana ZERO
Shared: Action · Platformer · Great Soundtrack

Celeste
Shared: Indie · Difficult · Platformer

The Messenger
Shared: Platformer · Retro · 2D

Hotline Miami
Shared: Action · Indie · Great Soundtrack

Pizza Tower
Shared: Indie · Great Soundtrack · Platformer

Freedom Planet
Shared: Action · Platformer · Indie

Skul: The Hero Slayer
Shared: Action · Indie · 2D

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

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

Out There Somewhere
Shared: Platformer · Indie · 2D

Nine Sols
Shared: Action · 2D · Platformer

Hotline Miami 2: Wrong Number
Shared: Action · Great Soundtrack · Difficult

VVVVVV
Shared: Platformer · Indie · Difficult

Axiom Verge
Shared: Indie · Platformer · Action

SANABI
Shared: Action · Indie · 2D

Electronic Super Joy
Shared: Indie · Platformer · Action

Defy Gravity Extended
Shared: Indie · Platformer · Action

Broforce
Shared: Action · 2D · Platformer