Games like Poly Fighter
Games like Poly Fighter include Vampire Survivors, Hades, Megabonk, Skul: The Hero Slayer, and Hades II. We matched them by the tags players give Poly Fighter on Steam (Roguelike, Fighting, Singleplayer, 2.5D, and Action): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Roguelite · Roguelike

Hades
Shared: Roguelite · Roguelike · Action Roguelike

Megabonk
Shared: Roguelike · Action Roguelike · Roguelite

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

Hades II
Shared: Roguelike · Action · Roguelite

Brotato
Shared: Roguelike · Singleplayer · Action Roguelike

BALL x PIT
Shared: Roguelike · Action · Roguelite

Rogue Legacy
Shared: Roguelike · Singleplayer · Action

DRAGON BALL FighterZ
Shared: Fighting · Action · 2D Fighter

Karate Survivor
Shared: Fighting · Roguelike · Action Roguelike

The Binding of Isaac: Rebirth
Shared: Roguelike · Action Roguelike · Singleplayer

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

Soulstone Survivors
Shared: Roguelike · Roguelite · Action Roguelike

Sephiria
Shared: Roguelike · Roguelite · Action Roguelike

Halls of Torment
Shared: Roguelike · Roguelite · Action Roguelike

Noobs Want to Live
Shared: Roguelike · 2.5D · Action

The Binding of Isaac
Shared: Roguelike · Action Roguelike · Action

Ravenswatch
Shared: Roguelike · Action · Action Roguelike

Street Fighter™ 6
Shared: Fighting · 2D Fighter · Action

Gunfire Reborn
Shared: Roguelike · Roguelite · Action

GUILTY GEAR -STRIVE-
Shared: Fighting · 2.5D · 2D Fighter

Mortal Kombat 1
Shared: Fighting · Action · 2D Fighter

Mortal Kombat X
Shared: Fighting · Action · Singleplayer

Dead Cells
Shared: Roguelike · Action Roguelike · Roguelite