A free program for Android, by Gamelion Studios.

Monster Shooter 2: Back to Earth is an arcade action and a popular download game. Here, you play the character Dumdum who rescued his cat from aliens. The aliens return in the follow-up, Monster Shooter 2: Back to Earth, and this time they threaten the entire world. High-quality visuals, 80 levels chock full of creatures and aliens, and four destructible environments are all features of Monster Shooter 2. The game has more than 20 weapons, including a working mech suit, as well as several adversaries and boss fights. Story, Survival, and Endless are the three available game modes. There are over 100 missions to finish, and there is also a co-op mode where players can cooperate with a friend.