Glad to see this on Newgrounds!
A great game with a lot of great features! Simple, sleek, and yet sophisticatedly customizable. There are unlockable guns, unlockable upgrades, which means a lot of replay value. Not to mention that within each game, there are achievements to strive for.
I feel greatly privileged to have been offered the opportunity to play test this game, and I absolutely love how it turned out! Best of luck for this and all your future projects!