good start, keep adding!
This game is really addicitve, i played for ages but still when i submitted my score i wasn't even 50th place for most points, add more baddies, weapons things like that and it would be sick, maybe a difficulty setting too? but from what you got so far, a good game, that's addictive and so so funny,
One thing, make it so you can change the song, it was getting annoyed with it at the end