Great game, I loved playing it.
I loved it! I was just playing the other games in the series yesterday. It's annoying some of the bugs I found...
When you look up, you still shoot infront of you
If you get hit and then jump or shoot straight away you don't get health taken away.
You stop when you shoot (probably not a bug but annoying at any rate)
All in all this is a great game series. I like playing them in my spare time, I hope you can fix some of the annoying bugs though...