Can't find much fault with it. Maybe more weapon upgrades at the end as you're left with a lot of resource. Great job!
One of the better games on newgrounds
The only thing I can really think of you adding to it would be to make that rock song much longer, maybe add a little story line or something to add more depth to the people you have to protect, and maybe make the camera shake a little bit, especially when you have the max main gun. I mean when that rock song was on and I'm unloading rounds and rounds into those damn things I want my gun freaking going wild. It made me think of the the mech fight in Matrix Revolutions where they were just unloading every freaking bullet they had into those things with their frustration behind every single round and their loved ones stuck in that damn hole and you just want to kill every freaking douche thats coming in and trying to kill them. Damn man the game makes you want to kill everything coming at you and you have to build the crap out of that aspect.
The game grades up nicely, and you seriously have to plan your upgrade purchases.
Overall, i have to say I wasn't blown away, and i had a lot of fun making sure of it! *grin*
A M A Z I N G!
this is simply amazing, the gameplay, upgarde system, vector graphics, the MUSIC!!!! i give it a full 10 on 10
awesome game and quite addictive too.