Games like LUMbA: REDUX
Games like LUMbA: REDUX include BALL x PIT, Bot Vice, Bit Blaster XL, Sky Force Reloaded, and Nova Drift. We matched them by the tags players give LUMbA: REDUX on Steam (Bullet Hell, Shoot 'Em Up, Top-Down Shooter, Tutorial, and Shooter): closest matches first, and among equally close ones the better-known games.

BALL x PIT
Shared: Bullet Hell · Arcade · Shoot 'Em Up

Bot Vice
Shared: Bullet Hell · Top-Down Shooter · Shoot 'Em Up

Bit Blaster XL
Shared: Bullet Hell · Shoot 'Em Up · Shooter

Sky Force Reloaded
Shared: Shoot 'Em Up · Bullet Hell · Top-Down Shooter

Nova Drift
Shared: Bullet Hell · Shoot 'Em Up · Arcade

20 Minutes Till Dawn
Shared: Bullet Hell · Shoot 'Em Up · Top-Down Shooter

DoDonPachi Resurrection
Shared: Shoot 'Em Up · Bullet Hell · Top-Down Shooter

LUFTRAUSERS
Shared: Bullet Hell · Arcade · Shoot 'Em Up

Revolution Ace
Shared: Shoot 'Em Up · Bullet Hell · Shooter

Planes, Bullets and Vodka
Shared: Shoot 'Em Up · Bullet Hell · Arcade

Chippy
Shared: Bullet Hell · Shoot 'Em Up · Top-Down Shooter

ZeroRanger
Shared: Shoot 'Em Up · Bullet Hell · Arcade

Vampire Survivors
Shared: Bullet Hell · 2D · Arcade

Ikaruga
Shared: Bullet Hell · Shoot 'Em Up · Arcade

BLUE REVOLVER
Shared: Bullet Hell · Shoot 'Em Up · Arcade

Touhou Kinjoukyou ~ Fossilized Wonders.
Shared: Bullet Hell · Shoot 'Em Up · Shooter

Crimzon Clover World EXplosion
Shared: Shoot 'Em Up · Bullet Hell · Top-Down Shooter

Insect Swarm
Shared: Shoot 'Em Up · Shooter · Top-Down Shooter

Exit the Gungeon
Shared: Bullet Hell · Arcade · 2D

Cyberhunt
Shared: Shoot 'Em Up · Arcade · 2D

Waves
Shared: Bullet Hell · Shoot 'Em Up · Shooter

Star Saviors
Shared: Bullet Hell · Shoot 'Em Up · Arcade

ESCHATOS
Shared: Bullet Hell · Shoot 'Em Up · Top-Down Shooter

Slime 3K: Rise Against Despot
Shared: Bullet Hell · Shoot 'Em Up · Top-Down Shooter