You say you're insulting the genre...
But really you're insulting yourself. This game isn't good enough to insult the high standards set for defense games by The Last Stand and other games like it. Sure the defense games are generic but each of them adds something different that make alot of them fun. This genre is pretty overdone but there are pretty creative people out there that can think of some brilliant ideas, and another game like The Last Stand could pop up anywhere at anytime. Anyways, on to the reasons that this game is a shitty insult.
Graphics - Not great, I could've expected more but based on everything else that went wrong with this little project I reallt shouldn't
Style- The genre is overdone, you admit that yourself. Yet you add to the overcooking. Sure you're making fun of those generic games but your game is twice as generic. Don't use the excuse that it's supposed to be.
Sound- Not that great. I don't recall any music. The firing sound and the sound of the bullet hitting zombie flesh got repetetive but it's supposed to be right?
Violence- It's a defense game with zombies. You can expect violence but not the best.
Interactivity- Moving the turret got especially hard when the zombies got right up in your grill. That made dying all the easier.
Humor- *cough cough* -yawn- *cough cough*
Overall- You attempted to make a sort of parody game that insults the twice baked genre of defense games. You succeded but your game sucks a little worse than the guys that tried to make something great and failed miserably. The difference? They actually had to put effort into making a bad game, like months or even years of wasted effort. You put in a couple months of effort in on making a game that was supposed to insult the defense genre. You should've put those couple months of effort into making a game better than all the other generic defense games. I'm sure it would've gained more points.