The problems with the game stem from the fact that you can't loose, meaning that to provide the player with a challenge many of the levels are just long stints of blowing stuff up. The story progresses well from level to level, but I have just lost interest after hitting the Yard level. Simply put, after a few upgrades the interface becomes awkward and there are so many enemies to kill that the gameplay looses pace.
I will probably play some more tomorrow, but right I just don't feel like