Games like Charlie II
Games like Charlie II include Shovel Knight: Treasure Trove, Broforce, SANABI, UFO 50, and Skul: The Hero Slayer. We matched them by the tags players give Charlie II on Steam (Action, Casual, Adventure, Indie, and Platformer): closest matches first, and among equally close ones the better-known games.

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

Broforce
Shared: Action · 2D · Pixel Graphics

SANABI
Shared: Action · Adventure · Pixel Graphics

UFO 50
Shared: Action · Indie · Retro

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

Out There Somewhere
Shared: Platformer · Indie · Adventure

Sonic Origins
Shared: Action · Adventure · Casual

Sonic Mania
Shared: Platformer · 2D · Retro

Gato Roboto
Shared: Action · Indie · Adventure

Cyberhunt
Shared: Action · Casual · Indie

Axiom Verge
Shared: Indie · Action · Platformer

Jump King
Shared: Indie · Adventure · Action

Katana ZERO
Shared: Action · Pixel Graphics · Platformer

The Messenger
Shared: Platformer · Retro · Action

Pikuniku
Shared: Casual · Adventure · Indie

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

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

BEEP
Shared: Indie · Adventure · Platformer

Celeste
Shared: Indie · Platformer · Pixel Graphics

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

Downwell
Shared: Indie · Action · Platformer

Vampire Survivors
Shared: Indie · 2D · Pixel Graphics

Hollow Knight
Shared: Platformer · Indie · 2D

Super Fancy Pants Adventure
Shared: Action · Adventure · Indie