Incredible game!
What a game you guys have made!
Let's start with the graphics and music: both so much fun! The oldschool look and sound made we want to play and play; I love it!
The gameplay itself is simple yet so addictive! I know a lot have complained about the time mode and I am aware that you are making a sandbox mode, but the time limit actually makes it pretty fun to compete against others for the best score (and the best player-chart makes this all the beter)!
One suggestion: I saw you made a few characters look like Rambo; wouldn't it be more fun if you'd make even more heroes such as Leon and Claire from Resident Evil, Shaun from Shaun of the Dead and more zombieheroes? Making them walk around would make the game even better. In fact, if you'd be interested and are reading this, I'd love to make some of these based on the models you used in the game (I use Photoshop)! Just a thought, so let me know if you think it's a good idea!
Any way, loved it, played it alot, great game! Keep up the good work!