I’m Sagan, Founder of GreenGrowthGames and I have a zombie game idea:
It will be a cartoonish Multiplayer LAN FPS where you’re in a fort with 6 floors, but your stuck on the 1st floor. Zombies are breaking down the doors but you can repair the doors with Tool Boxes. When you kill a zombie you get 10 dollars. There are 3 rounds per floor. When you get past the 3 rounds on the 1st floor the 2nd floor is unlocked etc. After each round you get a break where you can go to a Store Menu and buy new guns and Tool Boxes. The more rounds you survive the more zombies come. When you beat the last round of the last floor it goes to FreePlay mode where zombies spawn infinitely (every time you kill a zombie another one spawns in it’s place). Your start gun is a pistol but the guns you can buy are: Rifle, AK-47, Shotgun, Assault Rifle, Potato Gun, Flame-Thrower, Mini-Gun, Dual Uzi and Even a Insta-Kill no reload time bat (none of these have an ammo limit but they take time to reload except the bat).
I’m open for suggestions on guns and other aspects of the game so feel free to tell me. Can anybody help? Thanks! 
Have you ever hit someone with a bat? You have to reload though you’re calling it instakill…guess it’s special.
Not that I would know anything about that…
LAN? Seriously? LAN as in computers in one building? I think that’s a poor choice. I’ve never met anybody who places LAN games (unless it’s an Xbox occasionally). I think that online would be better.
Instead of money, why not find a more entertaining way of buying things? It’s the zombie apocalypse in a random building, who would you buy anything from? 
Like, I don’t know…zombie skulls, dropped by zombies when you kill them, that you use to hold down a scale that lifts up a door and lets you get whatever weapon. That’s just something I pulled out of my ass, it can be anything, really.
None of that is meant to sound mean. Please don’t take it that way.
How about Brains as a throwable object? You’d throw the brains and the zombies would go after it, sort of like the Monkey Bomb on Black Ops Zombies, but without exploding. Bagpipes, to make zombies dizzier, clumsier, and slower (I’m thinking about multiplayer strategy objects). Records to throw at zombies like Frisbees and a Cricket Bat to beat zombies down with (think Shawn of the Dead). Just a few ideas.
Just some honest advice: Unless you have something groundbreaking and exciting to bring to the table, -don’t even bother. The multiplayer zombie survival game is overdone and you’ll have a hard time competing with all of the others.
If you’re just doing this as a means to learn and grow as a developer, try challenging yourself with mechanics or ideas that will be deliberately hard for you to achieve. For example, if you’re not good at scripting AI, you can try to come up with extremely intelligent zombies who can see and hear the player, will react differently to the different guns the player uses, or perhaps will even pick up melee weapons from the environment to attack him with.
Yeah, if you are doing a cartoonish style, definitely go wacky and make it fun! Think TF2 humor but with zombies!
To me, it sounds like this guy is just starting out in the games field (just like me). If you want to make a game that will teach you a ton about game development, but is still hip, cool, and a fun game, then zombies are a perfectly ok way to go. No its not ground-breaking, but its simple and fun! Think about it. Its just a basic FPS with fun but easy to build AI. That’s what I’m building right now. I know it won’t change the world or sell well or anything, but its pushing my skills forward and teaching me new things!
Maybe I’m in a critical mood today, so take this how you like … but this game idea sounds like every other game that was already made. I don’t see anything original in it whatsoever. And I don’t mean that just because it’s another zombie game but you basically described very bog-standard level progression and game features. About the only parts that seem to have come from creativity are that it takes place in a fort (presumably you can make people think it’s a different game because it looks like a different environment) and that there’s something to do with fixing doors (sounds like fun?).
Have the zombies break off their own limbs and throw them at you.
That’s not a critical mood, that’s an honest one.