Games like Project Romboid
Games like Project Romboid include BALL x PIT, Vampire Survivors, Megabonk, Hades, and Hades II. We matched them by the tags players give Project Romboid on Steam (Action, Action Roguelike, Roguelite, Arcade, and Colorful): closest matches first, and among equally close ones the better-known games.

BALL x PIT
Shared: Action · Roguelite · Arcade

Vampire Survivors
Shared: Action Roguelike · Roguelite · Action

Megabonk
Shared: Action Roguelike · Roguelite · Roguelike

Hades
Shared: Action Roguelike · Roguelite · Action

Hades II
Shared: Action · Roguelite · Action Roguelike

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

Nova Drift
Shared: Roguelite · Action Roguelike · Arcade

Rocket Rats
Shared: Action Roguelike · Roguelite · Action

Halls of Torment
Shared: Action Roguelike · Roguelite · Action

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

Sephiria
Shared: Action Roguelike · Roguelite · Action

SYNTHETIK: Legion Rising
Shared: Roguelite · Action · Action Roguelike

Nuclear Throne
Shared: Action Roguelike · Roguelike · Action

SNKRX
Shared: Action Roguelike · Roguelite · Top-Down Shooter

Zombieville USA 3D
Shared: Action · Arcade · Action Roguelike

Gunfire Reborn
Shared: Roguelite · Roguelike · Action

Deep Rock Galactic: Survivor
Shared: Action Roguelike · Roguelite · Top-Down Shooter

Brotato
Shared: Action Roguelike · Roguelike · Roguelite

Blazing Beaks
Shared: Action Roguelike · Roguelite · Action

Yet Another Zombie Survivors
Shared: Action Roguelike · Roguelite · Arcade

The Spell Brigade
Shared: Roguelite · Action Roguelike · Action

Dead Cells
Shared: Action Roguelike · Roguelike · Roguelite

Ship of Fools
Shared: Action Roguelike · Roguelite · Action

Crab Champions
Shared: Action Roguelike · Arcade · Roguelike