Games like Gunnihilation
Games like Gunnihilation include Vampire Survivors, Skul: The Hero Slayer, Death Must Die, Windowkill, and LUFTRAUSERS. We matched them by the tags players give Gunnihilation on Steam (Action, Indie, Early Access, Bullet Hell, and 2D): closest matches first, and among equally close ones the better-known games.
Vampire Survivors
Shared: Bullet Hell · Indie · 2D
Skul: The Hero Slayer
Shared: Action · Indie · 2D
Death Must Die
Shared: Bullet Hell · Action · 2D
Windowkill
Shared: Action · Indie · Bullet Hell
LUFTRAUSERS
Shared: Indie · Action · Bullet Hell
Gensokyo Night Festival
Shared: Action · Indie · Early Access
Enter the Gungeon
Shared: Bullet Hell · Indie · Action
The Void Rains Upon Her Heart
Shared: Indie · Bullet Hell · Action
Just Shapes & Beats
Shared: Bullet Hell · Indie · Action
Dungeon Munchies
Shared: Action · Indie · 2D
Broforce
Shared: Action · 2D · Indie
Exit the Gungeon
Shared: Indie · Action · Bullet Hell
ShellShock Live
Shared: Action · 2D · Early Access
Streets of Rage 4
Shared: Action · Indie · 2D
Touhou Fuujinroku ~ Mountain of Faith.
Shared: Action · Indie · Bullet Hell
Cuphead
Shared: Indie · 2D · Bullet Hell
Megabonk
Shared: Indie · Bullet Hell · Action
BALL x PIT
Shared: Action · Bullet Hell · 2D
Nuclear Throne
Shared: Indie · Action · Bullet Hell
Be My Horde
Shared: Indie · Bullet Hell · Early Access
ZeroRanger
Shared: Indie · Action · Bullet Hell
Dust: An Elysian Tail
Shared: Action · Indie · 2D
Touhou Blooming Chaos 2
Shared: Action · Indie · Bullet Hell
Katana ZERO
Shared: Action · Indie · 2D