Games like Imperfections
Games like Imperfections include BALL x PIT, Deep Rock Galactic: Survivor, Rogue: Genesia, Vampire Survivors, and 20 Minutes Till Dawn. We matched them by the tags players give Imperfections on Steam (Bullet Hell, Top-Down Shooter, Flight, Real Time Tactics, and Roguelite): closest matches first, and among equally close ones the better-known games.

BALL x PIT
Shared: Bullet Hell · Roguelite · Top-Down Shooter

Deep Rock Galactic: Survivor
Shared: Bullet Hell · Top-Down Shooter · Roguelite

Rogue: Genesia
Shared: Bullet Hell · Roguelite · Arcade

Vampire Survivors
Shared: Bullet Hell · Roguelite · Arcade

20 Minutes Till Dawn
Shared: Bullet Hell · Top-Down Shooter · Roguelite

Glyphica: Typing Survival
Shared: Bullet Hell · Top-Down Shooter · Roguelite

Sky Force Reloaded
Shared: Bullet Hell · Top-Down Shooter · Arcade

Goobies
Shared: Top-Down Shooter · Bullet Hell · Roguelite

Halls of Torment
Shared: Bullet Hell · Roguelite · Arcade

Megabonk
Shared: Bullet Hell · Roguelite · Indie

The Spell Brigade
Shared: Bullet Hell · Roguelite · Top-Down Shooter

Yet Another Zombie Survivors
Shared: Top-Down Shooter · Roguelite · Arcade

Tiny Rogues
Shared: Bullet Hell · Top-Down Shooter · Roguelite

Nuclear Throne
Shared: Bullet Hell · Top-Down Shooter · Roguelite

SHOOPER NOVA
Shared: Bullet Hell · Roguelite · Strategy

Apocalypse Party
Shared: Top-Down Shooter · Bullet Hell · Roguelite

Nova Drift
Shared: Bullet Hell · Roguelite · Arcade

Slime 3K: Rise Against Despot
Shared: Bullet Hell · Roguelite · Top-Down Shooter

Asgard's Fall — Viking Survivors
Shared: Bullet Hell · Roguelite · Top-Down Shooter

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

Noobs Want to Live
Shared: Bullet Hell · Roguelite · 2.5D

Astro Prospector
Shared: Bullet Hell · Roguelite · Casual

Vital Shell
Shared: Bullet Hell · Roguelite · Top-Down Shooter

Brotato
Shared: Bullet Hell · Roguelite · Top-Down Shooter