There are some indoor levels, and with a shotgun and chainsaw (if possible) you get to kill hordes of incoming zombies, this will result in GORE everywhere!
All groups of creatures would have different stats though, some are just dwelling around, while others are constantly hunting for food. Some are very slow, while some are that fast, you almost can't see them (scary

Wouldn't that be fun? Now, ofcourse, if there are 5 levels of just clicking the left mouse button, it wouldn't be much fun after a while, so I think something else should be added too, like an interesting story, so I might start writing it this weekend, when I can't really create this game, since I'm not at home.
This idea looks cool to me because it is ideal for some fast gameplay, loaded in a few seconds, and it isn't that hard to make.