Games like Portal Dungeon
Games like Portal Dungeon include Enter the Gungeon, Vampire Survivors, Skul: The Hero Slayer, Dungreed, and Risk of Rain 2. We matched them by the tags players give Portal Dungeon on Steam (Action Roguelike, Roguelite, Multiplayer, Pixel Graphics, and Side Scroller): closest matches first, and among equally close ones the better-known games.

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

Vampire Survivors
Shared: Action Roguelike · Roguelite · Pixel Graphics

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

Dungreed
Shared: Action Roguelike · Roguelite · Pixel Graphics

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

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

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

Lost Castle
Shared: Action Roguelike · Side Scroller · Roguelite

Streets of Rogue
Shared: Action Roguelike · Roguelite · Multiplayer

Children of Morta
Shared: Multiplayer · Pixel Graphics · Action Roguelike

Gunfire Reborn
Shared: Roguelite · Roguelike · Multiplayer

Dead Cells
Shared: Action Roguelike · Roguelike · Pixel Graphics

Rogue Legacy
Shared: Action Roguelike · Roguelike · Platformer

Risk of Rain (2013)
Shared: Action Roguelike · Roguelike · Pixel Graphics

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

Megabonk
Shared: Action Roguelike · Roguelite · Roguelike

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

Nuclear Throne
Shared: Action Roguelike · Pixel Graphics · Roguelike

Hades
Shared: Action Roguelike · Roguelite · Roguelike

Sephiria
Shared: Action Roguelike · Roguelite · Roguelike

Broforce
Shared: Pixel Graphics · Multiplayer · Side Scroller

Noita
Shared: Pixel Graphics · Roguelike · Action Roguelike

Hero Siege
Shared: Action Roguelike · Pixel Graphics · Multiplayer

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