Games like Crystal sword
Games like Crystal sword include Shovel Knight: Treasure Trove, Broforce, Bloodstained: Curse of the Moon, SANABI, and Sonic Mania. We matched them by the tags players give Crystal sword on Steam (Action, 2D, Retro, Pixel Graphics, and Fantasy): closest matches first, and among equally close ones the better-known games.

Shovel Knight: Treasure Trove
Shared: Retro · Pixel Graphics · 2D

Broforce
Shared: Action · 2D · Pixel Graphics

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

SANABI
Shared: Action · Pixel Graphics · 2D

Sonic Mania
Shared: 2D · Retro · Pixel Graphics

UFO 50
Shared: Action · Retro · Pixel Graphics

Bloodstained: Curse of the Moon 2
Shared: Action · Retro · 2D

Skul: The Hero Slayer
Shared: Action · Pixel Graphics · 2D

Katana ZERO
Shared: Action · Pixel Graphics · 2D

The Messenger
Shared: Retro · Pixel Graphics · 2D

Door Kickers: Action Squad
Shared: Pixel Graphics · Action · Retro

Hotline Miami
Shared: Action · Pixel Graphics · Retro

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

Duck Game
Shared: Action · Pixel Graphics · 2D

Vampire Survivors
Shared: Pixel Graphics · 2D · Action

Infernax
Shared: Action · Pixel Graphics · Retro

Sonic Origins
Shared: Action · Retro · Pixel Graphics

BlazBlue Entropy Effect
Shared: 2D · Action · Pixel Graphics

The friends of Ringo Ishikawa
Shared: Action · Pixel Graphics · Retro

Huntdown
Shared: Action · Pixel Graphics · 2D

Evoland 2
Shared: Action · Retro · Pixel Graphics

METAL SLUG
Shared: Action · 2D · Retro

Gato Roboto
Shared: Action · Pixel Graphics · 2D

Warhammer 40,000: Boltgun
Shared: Retro · Action · Pixel Graphics