Lots of FUN
game is a LOT of fun, and can keep you going for a few hours.
The upgrades were great and i finally gave up on survival mode after like an hour.
My only problem with this game, is that ionce you get a good amount of the weapon upgrades, the game will start to massively lag if you just hold down fire, or fire in bursts. A lot of times i had to just fire once, wait, fire again, basically try and cluster them together and kill them in one shot.
It shouldnt be my computer or internet connection since im on cable internet, and running a phenom quad core 9750 with 8 gigs of ram and an 8600gt (the bottleneck of the system).
Anyways, great game, i had a lot of fun, and i totally reccomend this to anyone looking to kill some time and have fun.