Games like PION
Games like PION include Hades, SYNTHETIK: Legion Rising, Skul: The Hero Slayer, Vampire Survivors, and Megabonk. We matched them by the tags players give PION on Steam (Action Roguelike, Action, Indie, Top-Down Shooter, and Roguelite): closest matches first, and among equally close ones the better-known games.

Hades
Shared: Action Roguelike · Indie · Roguelite

SYNTHETIK: Legion Rising
Shared: Top-Down Shooter · Indie · Action

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

Vampire Survivors
Shared: Action Roguelike · Roguelite · Indie

Megabonk
Shared: Action Roguelike · Indie · Roguelite

Nuclear Throne
Shared: Action Roguelike · Indie · Action

Hades II
Shared: Action · Action Roguelike · Roguelite

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

BALL x PIT
Shared: Action · Roguelite · Action Roguelike

EVERSPACE™
Shared: Action Roguelike · Action · Indie

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

20 Minutes Till Dawn
Shared: Action Roguelike · Roguelite · Top-Down Shooter

Yet Another Zombie Survivors
Shared: Action Roguelike · Top-Down Shooter · Indie

Brigador: Up-Armored Edition
Shared: Action · Top-Down Shooter · Sci-fi

Streets of Rogue
Shared: Action Roguelike · Roguelite · Action

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

Teleglitch: Die More Edition
Shared: Action Roguelike · Indie · Top-Down Shooter

Gunfire Reborn
Shared: Roguelite · Indie · Action

Dungreed
Shared: Action Roguelike · Action · Roguelite

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

UnderMine
Shared: Action Roguelike · Roguelite · Indie

Halls of Torment
Shared: Action Roguelike · Roguelite · Action

Brotato
Shared: Action Roguelike · Roguelite · Sci-fi

SYNTHETIK 2
Shared: Action Roguelike · Top-Down Shooter · Roguelite