Games like Obsidian Crown
Games like Obsidian Crown include Vampire Survivors, Skul: The Hero Slayer, Hades, Megabonk, and Nuclear Throne. We matched them by the tags players give Obsidian Crown on Steam (Action Roguelike, Action, Indie, Roguelite, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Roguelite · Pixel Graphics

Skul: The Hero Slayer
Shared: Action · Action Roguelike · Indie

Hades
Shared: Action Roguelike · Roguelite · Indie

Megabonk
Shared: Action Roguelike · Roguelite · Indie

Nuclear Throne
Shared: Action Roguelike · Indie · Pixel Graphics

Streets of Rogue
Shared: Action Roguelike · Roguelite · Pixel Graphics

Enter the Gungeon
Shared: Action Roguelike · Pixel Graphics · Indie

Halls of Torment
Shared: Action Roguelike · Roguelite · Pixel Graphics

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Indie · Pixel Graphics

Dungreed
Shared: Action Roguelike · Action · Pixel Graphics

UnderMine
Shared: Action Roguelike · Roguelite · Pixel Graphics

Risk of Rain (2013)
Shared: Action Roguelike · Indie · Action

Death Must Die
Shared: Action Roguelike · Roguelite · Pixel Graphics

SYNTHETIK: Legion Rising
Shared: Indie · Action · Roguelite

Atomicrops
Shared: Action · Action Roguelike · Pixel Graphics

Hades II
Shared: Action · Roguelite · Action Roguelike

Wizard of Legend
Shared: Action Roguelike · Pixel Graphics · Action

Risk of Rain 2
Shared: Action Roguelike · Action · Roguelite

Rogue Legacy
Shared: Action Roguelike · Indie · Action

BALL x PIT
Shared: Action · Roguelite · Action Roguelike

Heroes of Hammerwatch
Shared: Action Roguelike · Roguelite · Pixel Graphics

Sephiria
Shared: Action Roguelike · Roguelite · Action

Star of Providence
Shared: Action Roguelike · Roguelite · Indie

ScourgeBringer
Shared: Action · Indie · Action Roguelike