Games like Tristar Mania
Games like Tristar Mania include Vampire Survivors, BALL x PIT, Exit the Gungeon, SANABI, and Katana ZERO. We matched them by the tags players give Tristar Mania on Steam (Action, Arcade, 2D Platformer, Bullet Hell, and 2D): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Pixel Graphics · 2D

BALL x PIT
Shared: Action · Arcade · Bullet Hell

Exit the Gungeon
Shared: Arcade · Action · Bullet Hell

SANABI
Shared: Action · Pixel Graphics · 2D Platformer

Katana ZERO
Shared: Action · Pixel Graphics · 2D Platformer

Terminator 2D: NO FATE
Shared: 2D Platformer · Arcade · Action

LUFTRAUSERS
Shared: Arcade · Action · Bullet Hell

Bit Blaster XL
Shared: Bullet Hell · Arcade · Action

Halls of Torment
Shared: Bullet Hell · Action · Pixel Graphics

Sonic Origins
Shared: Action · 2D Platformer · Pixel Graphics

Dome Keeper
Shared: Action · Sci-fi · Pixel Graphics

ZeroRanger
Shared: Action · Bullet Hell · Arcade

Commando Collection
Shared: Action · Arcade · Bullet Hell

Pizza Tower
Shared: 2D Platformer · Action · Pixel Graphics

UFO 50
Shared: Action · Arcade · Pixel Graphics

Star Saviors
Shared: Action · Bullet Hell · Arcade

Downwell
Shared: Arcade · Pixel Graphics · Action

Boneraiser Minions
Shared: Bullet Hell · Pixel Graphics · 2D

Planes, Bullets and Vodka
Shared: Action · Arcade · Bullet Hell

Broforce
Shared: Action · Pixel Graphics · 2D

Door Kickers: Action Squad
Shared: 2D Platformer · Action · Pixel Graphics

GRADIUS ORIGINS
Shared: Action · Arcade · 2D

Cyberhunt
Shared: Action · Arcade · 2D

Alex Jones: NWO Wars
Shared: Action · Arcade · 2D Platformer