Games like Startide
Games like Startide include Sky Force Reloaded, BALL x PIT, Revolution Ace, LUFTRAUSERS, and Bit Blaster XL. We matched them by the tags players give Startide on Steam (Action, Indie, Shoot 'Em Up, Shooter, and Top-Down Shooter): closest matches first, and among equally close ones the better-known games.
Sky Force Reloaded
Shared: Shoot 'Em Up · Action · Top-Down Shooter
BALL x PIT
Shared: Action · Bullet Hell · Shoot 'Em Up
Revolution Ace
Shared: Action · Shoot 'Em Up · Indie
LUFTRAUSERS
Shared: Indie · Action · Bullet Hell
Bit Blaster XL
Shared: Shoot 'Em Up · Bullet Hell · Shooter
SYNTHETIK: Legion Rising
Shared: Indie · Action · Top-Down Shooter
ZeroRanger
Shared: Indie · Shoot 'Em Up · Action
Nova Drift
Shared: Shoot 'Em Up · Bullet Hell · Shooter
Nuclear Throne
Shared: Indie · Action · Bullet Hell
Touhou Kouryudou ~ Unconnected Marketeers.
Shared: Action · Shoot 'Em Up · Bullet Hell
20 Minutes Till Dawn
Shared: Shoot 'Em Up · Bullet Hell · Top-Down Shooter
The Ascent
Shared: Action · Top-Down Shooter · Shooter
DRAINUS
Shared: Action · Indie · Shoot 'Em Up
Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Shoot 'Em Up · Action · Bullet Hell
Touhou Juuouen 〜 Unfinished Dream of All Living Ghost.
Shared: Action · Shoot 'Em Up · Shooter
Ikaruga
Shared: Shoot 'Em Up · Action · Bullet Hell
Star Saviors
Shared: Action · Shoot 'Em Up · Indie
KovaaK's
Shared: Action · Shooter · Indie
My Friend Pedro
Shared: Action · Indie · Shooter
BLUE REVOLVER
Shared: Shoot 'Em Up · Indie · Action
12 is Better Than 6
Shared: Action · Shooter · Indie
Star of Providence
Shared: Shoot 'Em Up · Indie · Bullet Hell
Touhou Kinjoukyou ～ Fossilized Wonders.
Shared: Shoot 'Em Up · Action · Shooter
Planes, Bullets and Vodka
Shared: Action · Shoot 'Em Up · Bullet Hell