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

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

Broforce
Shared: Action · Pixel Graphics · 2D

SANABI
Shared: Action · Adventure · Pixel Graphics

UFO 50
Shared: Indie · Action · Pixel Graphics

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

Out There Somewhere
Shared: Indie · Platformer · Adventure

Gato Roboto
Shared: Action · Indie · Adventure

Sonic Mania
Shared: Platformer · 2D · Adventure

Sonic Origins
Shared: Action · Adventure · Platformer

Axiom Verge
Shared: Indie · Action · Platformer

Jump King
Shared: Indie · Adventure · Action

Katana ZERO
Shared: Action · Pixel Graphics · Platformer

Cyberhunt
Shared: Action · Indie · Adventure

The Messenger
Shared: Platformer · Retro · Action

Bloodstained: Curse of the Moon
Shared: Action · Platformer · Pixel Graphics

Pikuniku
Shared: Adventure · Indie · Casual

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

Celeste
Shared: Indie · Pixel Graphics · Platformer

BEEP
Shared: Indie · Adventure · Platformer

Dungeon Munchies
Shared: Action · Indie · Adventure

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

Hollow Knight
Shared: Platformer · Indie · 2D

Downwell
Shared: Indie · Pixel Graphics · Action

Terraria
Shared: Adventure · 2D · Pixel Graphics