Games like Wallbreaker
Games like Wallbreaker include Vampire Survivors, Skul: The Hero Slayer, Hades, UnderMine, and Dungreed. We matched them by the tags players give Wallbreaker on Steam (Action, Action Roguelike, Roguelite, Perma Death, and 2D): 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 · Pixel Graphics

Hades
Shared: Action Roguelike · Roguelite · Action

UnderMine
Shared: Action Roguelike · Roguelite · Action

Dungreed
Shared: Action Roguelike · Action · Roguelite

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

Rogue Legacy
Shared: Action Roguelike · Action · 2D

Sephiria
Shared: Action Roguelike · Roguelite · Action

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

Dead Cells
Shared: Action Roguelike · Roguelite · 2D

Death Must Die
Shared: Action Roguelike · Roguelite · Action

Realm of the Mad God Exalt
Shared: Pixel Graphics · Action Roguelike · Perma Death

Halls of Torment
Shared: Action Roguelike · Roguelite · Action

Megabonk
Shared: Action Roguelike · Roguelite · Action

BALL x PIT
Shared: Action · Roguelite · Action Roguelike

Noita
Shared: Pixel Graphics · 2D · Action Roguelike

Nuclear Throne
Shared: Action Roguelike · Action · Pixel Graphics

BlazBlue Entropy Effect
Shared: Action Roguelike · Action · 2D

Streets of Rogue
Shared: Action Roguelike · Roguelite · Action

ScourgeBringer
Shared: Action · Roguelite · Action Roguelike

Boneraiser Minions
Shared: Action Roguelike · Roguelite · Pixel Graphics

Hades II
Shared: Action · Roguelite · Action Roguelike

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

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