Thanks for the comments so far, guys!
@Devne: The game was created as part of a school assignment, so the lack of depth came out of the lack of time we had to implement it. I'm so glad you pressed the Pause button. It's pretty rewarding to see an overview of the scale of the world you are playing in.
@Blobzone: It took us (5 people) about 2 months to complete the game to the stage it is in now. I'm glad you found the concept fun.
@Cortez01: The camera movement is one of the problems of this game. I am very much aware of it, but it's quite difficult to create a good camera for a game that takes place on a sphere. No excuses, though, I will do my best to update the game every once in a while.
I think people will find the game more enjoyable overall when the guys from Kongregate will decide to create some badges for this game. You'll have to wait a bit.
 "Escape from Planet Zombie"){kind=icon}