Games like Tretrais
Games like Tretrais include Vampire Survivors, Warhammer 40,000: Space Marine 2, Enter the Gungeon, Megabonk, and Death Must Die. We matched them by the tags players give Tretrais on Steam (Bullet Hell, Wargame, PvE, 2D Fighter, and Action-Adventure): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · 2D · Roguelike

Warhammer 40,000: Space Marine 2
Shared: PvE · Action · Action-Adventure

Enter the Gungeon
Shared: Bullet Hell · Roguelike · 2D

Megabonk
Shared: Bullet Hell · Roguelike · Action

Death Must Die
Shared: Bullet Hell · 2D · Roguelike

Brotato
Shared: Bullet Hell · Roguelike · Survival

BALL x PIT
Shared: Bullet Hell · Roguelike · Action

Skul: The Hero Slayer
Shared: Roguelike · 2D · Action

Realm of the Mad God Exalt
Shared: Bullet Hell · Roguelike · 2D

Rabbit and Steel
Shared: Bullet Hell · Roguelike · 2D

BlazBlue Entropy Effect
Shared: Action-Adventure · 2D · Action

Rogue: Genesia
Shared: Bullet Hell · PvE · Roguelike

Atomicrops
Shared: Bullet Hell · Roguelike · Action

Tower of Babel: Survivors of Chaos
Shared: Bullet Hell · Roguelike · 2D

Nuclear Throne
Shared: Bullet Hell · Roguelike · Action

Halls of Torment
Shared: Bullet Hell · Roguelike · Action

Iron Snout
Shared: 2D Fighter · Action · 2D

Crab Champions
Shared: Roguelike · Bullet Hell · PvE

Stick It to the Stickman
Shared: 2D Fighter · Roguelike · Action

Noobs Want to Live
Shared: Bullet Hell · Roguelike · Action

Duelists of Eden
Shared: Bullet Hell · PvE · 2D Fighter

One Finger Death Punch
Shared: 2D Fighter · Action · 2D

Desktop Survivors 98
Shared: Bullet Hell · Roguelike · 2D

Nomad Survival
Shared: Bullet Hell · PvE · Roguelike