There is still room for improvements
I like the concept of the game, it is really cool. But the game is repetitive --- all the levels look familiar. Yes, there are more and more zombies as levels progress, but the backgrounds look the same in each level. On the other hand, all you do is punching and kicking the same kind of zombies, It is impossible to pick up anything in the game and there is no boss fighting. Over all, it is a good game, but there is still room for improvements. For example, you can make more types of zombies that deal different amounts of damage. You can also allow the hero to pick up a knife or a gun in later stages of the game. Oh, by the way, adding a boss fight every five levels will improve the game as well. If you take my suggestions and use them if you want to make another zombie game. You are a good flash artist, but you have the potential to be great, keep improving,