Each level is its own contained thing, you will either have to smash a city, protect generators, destroy generators or fight off another monster. The main game mode is called, God of Destruction and this is where you will unlock the characters as you progress. Despite the lack of a story mode, I do feel that Godzilla has enough modes to keep you entertained. One thing that you do have to give them credit for is the game modes.
The levels may not be all that detailed, but I think this is by design so that all of the attention is focused firmly on Godzilla and his foes and allies! Protect And Destroy Each of the monsters looks just like you would expect them to. The people behind the game captured the Godzilla universe very well.
Hell, they could have even based it on the most recent Godzilla movie and I think that could have worked pretty well. I was very disappointed by this as I feel that a Godzilla game could have a strong and engaging story.