Games like Octogeddon
Games like Octogeddon include Vampire Survivors, Hades, Megabonk, Skul: The Hero Slayer, and BALL x PIT. We matched them by the tags players give Octogeddon on Steam (Action, Action Roguelike, Shoot 'Em Up, Indie, and Casual): closest matches first, and among equally close ones the better-known games.
Vampire Survivors
Shared: Action Roguelike · Indie · Roguelite
Hades
Shared: Action Roguelike · Action · Indie
Megabonk
Shared: Action Roguelike · Indie · Roguelike
Skul: The Hero Slayer
Shared: Action · Action Roguelike · Indie
BALL x PIT
Shared: Action · Action Roguelike · Shoot 'Em Up
The Binding of Isaac: Rebirth
Shared: Action Roguelike · Indie · Roguelike
Rogue Legacy
Shared: Action Roguelike · Action · Indie
Hades II
Shared: Action · Action Roguelike · Roguelike
The Binding of Isaac
Shared: Action Roguelike · Indie · Roguelike
20 Minutes Till Dawn
Shared: Action Roguelike · Shoot 'Em Up · Roguelite
Apocalypse Party
Shared: Action Roguelike · Casual · Shoot 'Em Up
Dungreed
Shared: Action Roguelike · Action · Indie
Nova Drift
Shared: Shoot 'Em Up · Action Roguelike · Roguelite
Risk of Rain 2
Shared: Action Roguelike · Action · Roguelike
Kingdom Rush - Tower Defense
Shared: Strategy · Action · Casual
Have a Nice Death
Shared: Action Roguelike · Action · Funny
Halls of Torment
Shared: Action Roguelike · Action · Roguelite
Risk of Rain (2013)
Shared: Action Roguelike · Action · Indie
Dead Cells
Shared: Action Roguelike · Roguelike · Roguelite
Star of Providence
Shared: Action Roguelike · Shoot 'Em Up · Action
Brotato
Shared: Action Roguelike · Roguelike · Singleplayer
Death Must Die
Shared: Action Roguelike · Action · Roguelite
Balatro
Shared: Roguelike · Strategy · Indie
Plants vs. Zombies GOTY Edition
Shared: Strategy · Casual · Singleplayer