Defend the Earth is an exciting arcade game developed by Roopkotha Studio for Android users. The game takes place in space where an unknown extraterrestrial civilization has attacked Earth. As a veteran space force pilot, you are the only hope for mankind to survive this attack. The game offers a thrilling gameplay experience with 20 levels in the campaign mode and an endless mode where you face never-ending waves of alien invaders and asteroids.

Defend the Earth offers four difficulty levels, namely, Easy, Normal, Hard, and Nightmare, which are designed to cater to players with different skill levels. The game also features six purchasable spaceships and four purchasable upgrades. To earn money, you need to destroy alien ships and asteroids. With the money you earn, you can buy new spaceships and upgrades to enhance your gameplay.

Overall, Defend the Earth is an action-packed game that offers an immersive experience to the players. The game is free to play and offers in-app purchases. If you are a fan of space adventure games, Defend the Earth is definitely worth checking out.