I hardy give out 10s anymore but...
Good job. It's the first flash game that has kept me entertained for over 2 days (and counting).
I beat all the challenges, beat all the story modes (except with Convict)
and my Survival mode record is 25. I think I could do better, but it would take too long and I don't have the patience.
I believe there's a bug in one of your challenges though.
In challenge #11, the description says it's a "free-for-all battle".
But in reality, it's a 1v3. They only attack and chase you.
Other than that, best flash game I've ever played.
Good job! =D