A free app for Android, by UbiMob.

Superhero Robot Premium: Hero Fight – is an offline role-playing game that allows you to take control of a group of heroes to battle against vicious robots in the future world. The world has been destroyed and your group of heroes is the only hope for mankind. As you progress through the story, you will need to use the skills you have to fight against different enemy robots. You will also need to collect the pieces of different weapons to protect yourself. You will have to battle to survive. 

The goal is to destroy all the enemy robots. You will also need to find all the parts of the weapons to protect yourself from their attacks.