Games like Transilio
Games like Transilio include Vampire Survivors, BALL x PIT, Enter the Gungeon, Megabonk, and Exit the Gungeon. We matched them by the tags players give Transilio on Steam (Bullet Hell, Action, Dungeon Crawler, Arcade, and 3D): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Pixel Graphics · Action

BALL x PIT
Shared: Action · Bullet Hell · Arcade

Enter the Gungeon
Shared: Bullet Hell · Dungeon Crawler · Pixel Graphics

Megabonk
Shared: Bullet Hell · Action · Indie

Exit the Gungeon
Shared: Action · Arcade · Bullet Hell

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

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

LUFTRAUSERS
Shared: Bullet Hell · Action · Arcade

Hotline Miami
Shared: Action · Top-Down · Pixel Graphics

UBERMOSH
Shared: Action · Arcade · Pixel Graphics

Sky Force Reloaded
Shared: Bullet Hell · Arcade · Action

UBERMOSH Vol.3
Shared: Action · Arcade · Bullet Hell

UBERMOSH Vol.5
Shared: Action · Arcade · Bullet Hell

UnderMine
Shared: Dungeon Crawler · Action · Pixel Graphics

Archvale
Shared: Action · Bullet Hell · Pixel Graphics

Hotline Miami 2: Wrong Number
Shared: Action · Pixel Graphics · Top-Down

Bit Blaster XL
Shared: Bullet Hell · Arcade · Action

Tiny Rogues
Shared: Bullet Hell · Dungeon Crawler · Top-Down

UBERMOSH:BLACK
Shared: Action · Bullet Hell · Arcade

Project Lazarus
Shared: Action · Bullet Hell · Arcade

Monsters are Coming!
Shared: Action · Bullet Hell · Top-Down

Noobs Want to Live
Shared: Bullet Hell · Action · Pixel Graphics

Star of Providence
Shared: Bullet Hell · Action · Dungeon Crawler

Hammerwatch
Shared: Dungeon Crawler · Action · Pixel Graphics