Very nicely made!
I must say these sort of games are my favourite, so this review may be a little biased but nontheless, that game seemed very addicting and it had a nice difficulty to it. I still can't get pass level 6 though. =P
Great idea of being able to pick up the agents and use them as a weapon, as is the wide range of weapons I had found so far. I think the area of play does get destroyed too quickly for how long the game seems to go on (I was finding it quite hard to go up and down the building without falling down about 4 stories.)
Great job. =D