Games like Waves 2: Notorious
Games like Waves 2: Notorious include Deep Rock Galactic: Survivor, Nova Drift, Sektori, Waves, and BALL x PIT. We matched them by the tags players give Waves 2: Notorious on Steam (Action Roguelike, Arena Shooter, Bullet Hell, Shoot 'Em Up, and Top-Down Shooter): closest matches first, and among equally close ones the better-known games.

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

Nova Drift
Shared: Bullet Hell · Shoot 'Em Up · Action Roguelike

Sektori
Shared: Shoot 'Em Up · Arena Shooter · Twin Stick Shooter

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

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

Chippy
Shared: Bullet Hell · Arena Shooter · Shoot 'Em Up

SNKRX
Shared: Action Roguelike · Arena Shooter · Shoot 'Em Up

X Invader
Shared: Arena Shooter · Action Roguelike · Shoot 'Em Up

Time Wasters
Shared: Action Roguelike · Bullet Hell · Arena Shooter

Glyphica: Typing Survival
Shared: Action Roguelike · Arena Shooter · Bullet Hell

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

Brotato
Shared: Action Roguelike · Bullet Hell · Arena Shooter

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

Voidigo
Shared: Action Roguelike · Bullet Hell · Twin Stick Shooter

Enter the Gungeon
Shared: Action Roguelike · Bullet Hell · Twin Stick Shooter

Go Mecha Ball
Shared: Shoot 'Em Up · Bullet Hell · Twin Stick Shooter

Pesticide Not Required
Shared: Action Roguelike · Bullet Hell · Shoot 'Em Up

Nex Machina
Shared: Bullet Hell · Twin Stick Shooter · Shoot 'Em Up

Titan Attacks!
Shared: Arena Shooter · Bullet Hell · Shoot 'Em Up

SYNTHETIK: Legion Rising
Shared: Action Roguelike · Top-Down Shooter · Twin Stick Shooter

Rogue: Genesia
Shared: Action Roguelike · Bullet Hell · Twin Stick Shooter

Relic Hunters Zero: Remix
Shared: Action Roguelike · Twin Stick Shooter · Top-Down Shooter

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Arcade

ANVIL
Shared: Action Roguelike · Top-Down Shooter · Twin Stick Shooter