Games like Octo Armada
Games like Octo Armada include Vampire Survivors, Megabonk, Skul: The Hero Slayer, Death Must Die, and Halls of Torment. We matched them by the tags players give Octo Armada on Steam (Action Roguelike, Action, Casual, Bullet Hell, and Roguelite): closest matches first, and among equally close ones the better-known games.
Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite
Megabonk
Shared: Action Roguelike · Roguelite · Bullet Hell
Skul: The Hero Slayer
Shared: Action · Action Roguelike · Indie
Death Must Die
Shared: Action Roguelike · Bullet Hell · Roguelite
Halls of Torment
Shared: Action Roguelike · Bullet Hell · Roguelite
Enter the Gungeon
Shared: Action Roguelike · Bullet Hell · Roguelike
Hades
Shared: Action Roguelike · Roguelite · Action
BALL x PIT
Shared: Action · Roguelite · Action Roguelike
Nuclear Throne
Shared: Action Roguelike · Action · Roguelike
The Binding of Isaac: Rebirth
Shared: Action Roguelike · Roguelike · Indie
Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Roguelite
Dungreed
Shared: Action Roguelike · Action · Roguelite
Brotato
Shared: Action Roguelike · Bullet Hell · Roguelike
Noobs Want to Live
Shared: Bullet Hell · Action · Action Roguelike
Rocket Rats
Shared: Action Roguelike · Casual · Bullet Hell
Dead Cells
Shared: Action Roguelike · Roguelike · Roguelite
Rogue Legacy
Shared: Action Roguelike · Action · Roguelike
Seraph's Last Stand
Shared: Action Roguelike · Casual · Bullet Hell
20 Minutes Till Dawn
Shared: Action Roguelike · Bullet Hell · Roguelite
Hades II
Shared: Action · Action Roguelike · Roguelite
Star of Providence
Shared: Action Roguelike · Bullet Hell · Roguelite
Asgard's Fall — Viking Survivors
Shared: Action Roguelike · Bullet Hell · Casual
Risk of Rain (2013)
Shared: Action Roguelike · Action · Roguelike
Soulstone Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite