Games like Generations Of Destruction
Games like Generations Of Destruction include Vampire Survivors, BALL x PIT, Bit Blaster XL, Nova Drift, and Star of Providence. We matched them by the tags players give Generations Of Destruction on Steam (Bullet Hell, Shoot 'Em Up, Action, 2D, and Aliens): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · 2D · Roguelite

BALL x PIT
Shared: Action · Bullet Hell · Shoot 'Em Up

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

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

Star of Providence
Shared: Bullet Hell · Shoot 'Em Up · Action

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

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

Death Must Die
Shared: Bullet Hell · Action · 2D

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

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

20 Minutes Till Dawn
Shared: Bullet Hell · Shoot 'Em Up · Roguelite

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

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

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

Greedland
Shared: Shoot 'Em Up · Bullet Hell · Sci-fi

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

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

Skul: The Hero Slayer
Shared: Action · 2D · Indie

Brotato
Shared: Bullet Hell · Singleplayer · Sci-fi

Time Wasters
Shared: Bullet Hell · Shoot 'Em Up · 2D

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

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

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

I Am Legion: Stand Survivors
Shared: Bullet Hell · Shoot 'Em Up · 2D