Games like Aluna Rift
Games like Aluna Rift include Megabonk, Nova Drift, BALL x PIT, The Spell Brigade, and Vampire Survivors. We matched them by the tags players give Aluna Rift on Steam (Bullet Hell, Bullet Heaven, Shoot 'Em Up, Difficult, and Arcade): closest matches first, and among equally close ones the better-known games.

Megabonk
Shared: Bullet Heaven · Bullet Hell · Roguelite

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

BALL x PIT
Shared: Bullet Hell · Arcade · Roguelite

The Spell Brigade
Shared: Bullet Heaven · Bullet Hell · Co-op

Vampire Survivors
Shared: Bullet Hell · Roguelite · Action Roguelike

Risk of Rain 2
Shared: Co-op · Roguelite · Action

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

Brotato
Shared: Bullet Hell · Bullet Heaven · Roguelite

Enter the Gungeon
Shared: Bullet Hell · Difficult · Co-op

20 Minutes Till Dawn
Shared: Bullet Hell · Shoot 'Em Up · Roguelite

Deep Rock Galactic: Survivor
Shared: Bullet Heaven · Bullet Hell · Roguelite

Soulstone Survivors
Shared: Bullet Heaven · Bullet Hell · Roguelite

Halls of Torment
Shared: Bullet Hell · Roguelite · Bullet Heaven

Cuphead
Shared: Co-op · Difficult · Bullet Hell

Nuclear Throne
Shared: Bullet Hell · Difficult · Roguelite

Rogue: Genesia
Shared: Bullet Hell · Bullet Heaven · Arcade

Star of Providence
Shared: Bullet Hell · Shoot 'Em Up · Roguelite

Time Wasters
Shared: Bullet Heaven · Bullet Hell · Shoot 'Em Up

Death Must Die
Shared: Bullet Hell · Bullet Heaven · Roguelite

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

Yet Another Zombie Survivors
Shared: Bullet Heaven · Roguelite · Arcade

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

SYNTHETIK: Legion Rising
Shared: Roguelite · Co-op · Difficult

Pathogenic
Shared: Bullet Hell · Bullet Heaven · Difficult