Games like Nova Rebellion
Games like Nova Rebellion include Escape From Duckov, Cyberhunt, Halo: Spartan Assault, BALL x PIT, and Broforce. We matched them by the tags players give Nova Rebellion on Steam (Shoot 'Em Up, Action, Top-Down Shooter, Shooter, and 2D): closest matches first, and among equally close ones the better-known games.

Escape From Duckov
Shared: Action · Adventure · Top-Down Shooter

Cyberhunt
Shared: Action · Shoot 'Em Up · Adventure

Halo: Spartan Assault
Shared: Action · Top-Down Shooter · Shooter

BALL x PIT
Shared: Action · Shoot 'Em Up · Top-Down Shooter

Broforce
Shared: Action · 2D · Pixel Graphics

Zombotron
Shared: Action · 2D · Adventure

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

12 is Better Than 6
Shared: Action · Shooter · Top-Down Shooter

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

BioShock Infinite
Shared: Action · Shooter · Adventure

SANABI
Shared: Action · Pixel Graphics · Adventure

Bit Blaster XL
Shared: Shoot 'Em Up · Shooter · Action

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

Shadowgrounds
Shared: Top-Down Shooter · Action · Shooter

Half-Life 2
Shared: Action · Shooter · Sci-fi

Huntdown
Shared: Action · Shooter · Shoot 'Em Up

STAR WARS™ Battlefront™ II
Shared: Shooter · Action · Space

NOT A HERO
Shared: Action · Shooter · Adventure

Revolution Ace
Shared: Shoot 'Em Up · Action · Shooter

Planes, Bullets and Vodka
Shared: Action · Shoot 'Em Up · Shooter

HELLDIVERS™ Dive Harder Edition
Shared: Top-Down Shooter · Action · Shooter

DRAINUS
Shared: Shoot 'Em Up · Action · Shooter

Snake Force
Shared: Action · Top-Down Shooter · Shooter

Chorus
Shared: Action · Adventure · Shooter