Games like Strania - The Stella Machina -
Games like Strania - The Stella Machina - include Ikaruga, Mushihimesama, ZeroRanger, Bit Blaster XL, and Nova Drift. We matched them by the tags players give Strania - The Stella Machina - on Steam (Action, Shoot 'Em Up, Mechs, Bullet Hell, and Anime): closest matches first, and among equally close ones the better-known games.

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

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

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

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

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

Star Saviors
Shared: Shoot 'Em Up · Action · Bullet Hell

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

Revolution Ace
Shared: Action · Shoot 'Em Up · Bullet Hell

Titanfall® 2
Shared: Mechs · Action · Shooter

BALL x PIT
Shared: Action · Bullet Hell · Arcade

LUFTRAUSERS
Shared: Action · Bullet Hell · Arcade

BLUE REVOLVER
Shared: Shoot 'Em Up · Action · Bullet Hell

DoDonPachi Resurrection
Shared: Shoot 'Em Up · Bullet Hell · Action

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

DARIUSBURST Chronicle Saviours
Shared: Shoot 'Em Up · Action · Arcade

DAEMON X MACHINA
Shared: Action · Mechs · Anime

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

Nex Machina
Shared: Action · Bullet Hell · Shoot 'Em Up

Geometry Wars™ 3: Dimensions Evolved
Shared: Action · Shoot 'Em Up · Bullet Hell

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

DEVIL BLADE REBOOT
Shared: Shoot 'Em Up · Action · Mechs

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

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

Touhou Fuujinroku ~ Mountain of Faith.
Shared: Action · Bullet Hell · Shoot 'Em Up