Something bad happened to us and the last of humans have been slain by evil robots. You are controlling THE LAST humanoid battle droid, slaying the endless hordes of mechanized beasts!
The fighting is very fast paced and explosive arena styled shooting, where the enemy comes after you in waves. Occasionally you encounter a bigger, more difficult boss droid. You can upgrade and fix your droid between waves, boost shields, buy various pets with different weapons etc. There's lots of cool stuff you can buy - if you have the money. I found myself being in constant lack of it and never really managed to unlock everything.
It's a fun game with a lot of hectic action. Sometimes I lost myself under all the light effects, explosions and enemy swarms and it felt like I was watching an ant hill under attack. But in game's defense, I've never been good at this type of games so someone with more 1337-powers surely saves the humanity in no time.
It's a very easily approachable and entertaining "Puppy Game" that doesn't disappoint.