The app has a beautiful and minimalistic design. The controls are easy to learn and fun to play.

The game is set in the future, where mankind has been forced to live in underground cities because of an invasion of vicious aliens. In order to survive, mankind has developed new weapons, such as the delta blaster, which is a large weapon that is capable of firing bullets and other projectiles. The main character is a human who is the last hope of humanity. He is going to fight against the enemies in the underground cities.

The enemies are not your typical aliens. They are much more dangerous. They have the ability to shoot bullets and other projectiles. The main character will have to learn how to use the weapon and defend himself against the enemies.

There is a storyline in the game. The main character will have to go through a number of challenges.