Duke is that you?
lots o potential in this one. I didn't find it too easy or too hard, the trick is to use the least amount of rockets to achieve the high score. It's like Worms meets Plants vs Zombies or something.
I hope you intentionally made the bazooka wielding character look like Duke Nukem on purpose.
I would revamp this game, put in more different zombies, different traps, different rockets and perhaps make some new zombie death animations.
And a huge giant zombie overlord boss at the end of the game..