Not my favorite theme (so many good choices, but yet again everyone picked a safe generic one :|) but I think I settled on an idea after throwing away about 3 more ambitious ones.

The main character arrives unarmed at a cemetery for some undecided reason, and encounters a hobo that hands him a shotgun while delivering the line.  He enters the cemetery and sure enough, the dead are rising.  You shoot zombies for a bit from a top down arena shooter perspective then all of a sudden the hobo comes back and says something like “no wait, I promised that one to my buddy” and takes the shotgun away and gives you some other weapon.

Long story short, you’ll fight zombies and every 20-30 seconds the hobo will come back and give you some other weapon to kill zombies with.  My plan is to make it interesting by coming up with wacky things to use as weapons.  I’d like to add another layer of gameplay by varying the types of zombies and making them weak to certain classes of weapons but not others.

I might change it from zombies to something else since they’re overdone but naturally its the first aesthetic that came to mind.   Now off to work!