Games like PORTAL EFFECT: Alien Survival

Here are some great alternatives to PORTAL EFFECT: Alien Survival by Digital Castle Entertainment :
Galaxy Alien Invaders Classic
Galaxy Alien Invaders Classic
★4.2
Space Predators: Alien Strike
Space Predators: Alien Strike
★3.4
Portal Hero 3D - Action Game
Portal Hero 3D - Action Game
★4.7
Air Force - Alien Invader
Air Force - Alien Invader
★4.6
Space Quest: Alien Invasion
Space Quest: Alien Invasion
★4.4
Xeno Alien Shooter: Space Game
Xeno Alien Shooter: Space Game
★4.2
Hangar Case: Survival Games
Hangar Case: Survival Games
★4.5
Predator vs Aliens 2 Return
Predator vs Aliens 2 Return
★3.4
Portal Of Doom: Undead Rising
Portal Of Doom: Undead Rising
★3.7
Inside: UFO Escape Story
Inside: UFO Escape Story
★4.0
Alien Attack: Idle Arcade Game
Alien Attack: Idle Arcade Game
★4.2
Alien Invasion: RPG Idle Space
Alien Invasion: RPG Idle Space
★4.3
Find the Alien - Alien Game
Find the Alien - Alien Game
★4.7
Space Hero: Invasion Shooter
Space Hero: Invasion Shooter
★3.7
Alien Assassin - Animal Hunt
Alien Assassin - Animal Hunt
★3.7
Galaxy Fight: Aircraft Shooter
Galaxy Fight: Aircraft Shooter
★4.5