Space Invaders HD: Nebula Mission has more complex gameplay then other space shooters. Required skills are more than fast reactions and memorizing UFO's and alien ship attack patterns. The player must also have strategy skills to equip proper upgrades and use the appropriate skills during specific space missions.
You can check it here:
https://play.google.com/store/apps/details?id=com.bitgames.spaceinvaders
Features:
# 8 different alien spieces with 100+ invader spaceships and alien ufos to fight against
# 100 missions in 16 unlockable galaxies war with 3 difficulty levels
# Ability to change weapons and use active skills during the space missions
# 6+ fully customizable spaceships with 120+ upgrades (including turrets and special modules)
# Mega alien bosses
# Continuously challenging survival mode with infinite stages
# Ultra hard Chaos Rise war mode for elite players



You can check it here:
https://play.google.com/store/apps/details?id=com.bitgames.spaceinvaders
Features:
# 8 different alien spieces with 100+ invader spaceships and alien ufos to fight against
# 100 missions in 16 unlockable galaxies war with 3 difficulty levels
# Ability to change weapons and use active skills during the space missions
# 6+ fully customizable spaceships with 120+ upgrades (including turrets and special modules)
# Mega alien bosses
# Continuously challenging survival mode with infinite stages
# Ultra hard Chaos Rise war mode for elite players


