Games like Deathsmiles I・II
Games like Deathsmiles I・II include Alex Jones: NWO Wars, Bit Blaster XL, BALL x PIT, Huntdown, and METAL SLUG. We matched them by the tags players give Deathsmiles I・II on Steam (Action, Arcade, Shoot 'Em Up, Shooter, and Bullet Hell): closest matches first, and among equally close ones the better-known games.

Alex Jones: NWO Wars
Shared: Action · Arcade · Shooter

Bit Blaster XL
Shared: Shoot 'Em Up · Bullet Hell · Arcade

BALL x PIT
Shared: Action · Arcade · Bullet Hell

Huntdown
Shared: Action · Shooter · Shoot 'Em Up

METAL SLUG
Shared: Action · Arcade · Shoot 'Em Up

DRAINUS
Shared: Action · Shoot 'Em Up · Shooter

Neptunia Shooter
Shared: Action · Shoot 'Em Up · Bullet Hell

LUFTRAUSERS
Shared: Arcade · Action · Bullet Hell

Mirage Feathers
Shared: Bullet Hell · Shoot 'Em Up · Cute

Nova Drift
Shared: Shoot 'Em Up · Arcade · Bullet Hell

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

Deathsmiles
Shared: Action · Shoot 'Em Up · Arcade

METAL SLUG X
Shared: Action · Arcade · Shoot 'Em Up

METAL SLUG 3
Shared: Arcade · Action · Side Scroller

Mushihimesama
Shared: Arcade · Shoot 'Em Up · Action

Exit the Gungeon
Shared: Arcade · Action · Bullet Hell

Broforce
Shared: Action · 2D · Shooter

ZeroRanger
Shared: Shoot 'Em Up · Action · Bullet Hell

DoDonPachi Resurrection
Shared: Shoot 'Em Up · Arcade · Shooter

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

Vampire Survivors
Shared: Bullet Hell · 2D · Arcade

Touhou Kouryudou ~ Unconnected Marketeers.
Shared: Action · Shoot 'Em Up · Bullet Hell

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

Terminator 2D: NO FATE
Shared: Arcade · Action · 2D Platformer