got to wave 50...love this game but as some other commenters have said this at least needs a "send next wave" button of some kind. it would speed things up a bit. and i agree with Tamasaka13...all u really need is the sentry turret and upgrade the hell outta it...and a shotgun comes in handy later too...
i actually like this game for a couple of reasons...first, although i will admit the storyline is cheesy, its good. Secondly, its got its own level of difficulty to it. trying to cap a guy in the back of the skull while he is running is pretty difficult. graphics are a plus...i mean, how many flash games can you play when a well aimed shot blows a guys head clean off his body...anyway...kudos to the creator. excellent game