Games like Alien Defence - Save Area51

Here are some great alternatives to Alien Defence - Save Area51 by GOODROID,Inc. :
Alien Shooter: Galaxy Invaders
Alien Shooter: Galaxy Invaders
★4.5
Alien Attack: Idle Arcade Game
Alien Attack: Idle Arcade Game
★4.2
Space Force: Alien Shooter War
Space Force: Alien Shooter War
★4.3
Space Cadet Defender Invaders
Space Cadet Defender Invaders
★4.5
Operation: New Earth
Operation: New Earth
★3.8
Alien Swarm
Alien Swarm
★4.2
Outer Space Alien Invaders
Outer Space Alien Invaders
★3.5
Invaders from Androidia
Invaders from Androidia
★4.2
Chaos Galaxy - Space Shooter
Chaos Galaxy - Space Shooter
★4.3
Galaxia Invader: Alien Shooter
Galaxia Invader: Alien Shooter
★4.5
Iron Marines Offline Strategy
Iron Marines Offline Strategy
★4.7
Galaxy Invader: Alien Shooting
Galaxy Invader: Alien Shooting
★4.7
Infinity Shooter
Infinity Shooter
★4.2
Retro Space War: Shooter Game
Retro Space War: Shooter Game
★4.5
Galaxy Shooter: Arcade Attack
Galaxy Shooter: Arcade Attack
★3.7
Alien Shooter Space War Games
Alien Shooter Space War Games
★4.4