Great game.
Yes, it is a great game, there isn't anything particularly wrong with it in it's current state, however there are many possible improvements.
First off the gameplay is solid, and enjoyable, and bug free, and it is alot of fun as you unlock better weapons and invent your own strategys as to how to survive the round, however eventually you ulock all the weapons and realise only the flamethrower is only gun worth using and are left with a turret farm as an outlet to all your surplus cash... thats no fun in the end, however it being a flash game, this is kinda to be expected after a while.
Basically, it's fun untill you realise the flame thrower is the best, theny our left with tons of cash and nothing to spend it on, which, unless your into suicide, means it's the end of the game, what you could do to improve the longevity of this game is huge as there are so many different possibilities, although this game can go without, it would be nice to have some other content.