Games like Asteroids and Aliens
Games like Asteroids and Aliens include Alex Jones: NWO Wars, Planes, Bullets and Vodka, BALL x PIT, Bit Blaster XL, and Cyberhunt. We matched them by the tags players give Asteroids and Aliens on Steam (2D Platformer, Shoot 'Em Up, Top-Down Shooter, Shooter, and Tabletop): closest matches first, and among equally close ones the better-known games.

Alex Jones: NWO Wars
Shared: 2D Platformer · Shooter · Shoot 'Em Up

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

BALL x PIT
Shared: Action · Arcade · Shoot 'Em Up

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

Cyberhunt
Shared: Shoot 'Em Up · Action · Arcade

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

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

Nova Drift
Shared: Shoot 'Em Up · Arcade · Shooter

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

SNKRX
Shared: Top-Down Shooter · Shoot 'Em Up · Shooter

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

Contra: Operation Galuga
Shared: 2D Platformer · Shooter · Shoot 'Em Up

State of Anarchy
Shared: Shoot 'Em Up · Top-Down Shooter · Action

Starblast
Shared: Shoot 'Em Up · Action · Arcade

Pizza Tower
Shared: 2D Platformer · Cartoony · Action

Huntdown
Shared: Shooter · Shoot 'Em Up · Action

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

Crimzon Clover World EXplosion
Shared: Shoot 'Em Up · Action · Shooter

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

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

RIP - Trilogy™
Shared: Shooter · Arcade · Shoot 'Em Up

Commando Collection
Shared: Shooter · Action · Arcade

LUFTRAUSERS
Shared: Arcade · Shoot 'Em Up · Action

Star Saviors
Shared: Shoot 'Em Up · Action · Arcade