Not bad, pretty enjoyable! I played the first level and almost beat it.
Just some minor things
Firstly..The radio in the starting zone..Its cool and all, but it keeps repeating each phrase twice which became a nuisance when I was reading the info.
The bots! Its really cool, but I personally would prefer a larger hit box on them. They are tough without a hitbox that is really pesky to land a shot on~
The timer! I died with two minutes remaining in the mission timer, but then I was made to wait 15minutes to play again. It would be nice if instead of the HUD tracking your dead/alive you had a timer on the wall of some sort that counted down with the mission. That way, everyone who died can play again right as the mission ends. Rather than having to wait the extra time on the HUD...Unless you designed it that way for a reason?
Anyhow, Just my two cents.