Games like Mystical
Games like Mystical include BALL x PIT, METAL SLUG, Guns, Gore & Cannoli, Guns, Gore and Cannoli 2, and METAL SLUG X. We matched them by the tags players give Mystical on Steam (Action, 2D, and Shoot 'Em Up): closest matches first, and among equally close ones the better-known games.

BALL x PIT
Shared: Action · Shoot 'Em Up · 2D

METAL SLUG
Shared: Action · 2D · Shoot 'Em Up

Guns, Gore & Cannoli
Shared: Action · 2D · Shoot 'Em Up

Guns, Gore and Cannoli 2
Shared: Action · 2D · Shoot 'Em Up

METAL SLUG X
Shared: Action · 2D · Shoot 'Em Up

Broforce
Shared: Action · 2D

Zombotron
Shared: Action · 2D · Shoot 'Em Up

Bit Blaster XL
Shared: Shoot 'Em Up · 2D · Action

Planes, Bullets and Vodka
Shared: Action · Shoot 'Em Up · 2D

BlazBlue Entropy Effect
Shared: 2D · Action

Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Shoot 'Em Up · Action · 2D

METAL SLUG 2
Shared: Action · 2D · Shoot 'Em Up

Huntdown
Shared: Action · Shoot 'Em Up · 2D

Cyberhunt
Shared: Action · Shoot 'Em Up · 2D

DRAINUS
Shared: Action · Shoot 'Em Up · 2D

Skul: The Hero Slayer
Shared: Action · 2D

LUFTRAUSERS
Shared: Action · 2D · Shoot 'Em Up

Touhou Juuouen 〜 Unfinished Dream of All Living Ghost.
Shared: Action · Shoot 'Em Up · 2D

Alex Jones: NWO Wars
Shared: Action · Shoot 'Em Up · 2D

Star Saviors
Shared: Action · Shoot 'Em Up · 2D

ZeroRanger
Shared: Shoot 'Em Up · Action · 2D

Jets'n'Guns 2
Shared: Action · Shoot 'Em Up · 2D

Nova Drift
Shared: Shoot 'Em Up · 2D · Action

Jet Lancer
Shared: Action · Shoot 'Em Up · 2D