I found some more bugs: When you load up the game and you choose English and later change it to Spanish, the signs and people will still be in English and the same way if you chose Spanish first but everything else will be normal. In the options menu, when changed to Spanish, will not set you at the bottom option if you keep on pressing up. I think it is because the is no herd/horde option in Spanish. If you cheated to give yourself all the characters then the sheriffs partner will keep on re spawning. Sometimes when you switch guns you will loose all of the ammo you had. Sometimes when i spawned in weapons they were slightly floating but still in reach. When you have the tower upgraded second to last, the next upgrade says its locked but you can still upgrade it. On the entrance/exit into the swamp water coming from/towards the town, the boardwalks to get onto land don't work . I think they are placed with the wrong side facing out.
The music in the menu before you start to play the game will stop eventually.
I was thinking you can limit the upgrades on structure depending on horde waves. You can make it so each zombie will add 1-3 minutes before the herd/horde arrive at the base (You can have it that the first safe-house upgrade makes it each zombie adds one minute, the next upgrade makes each zombie add 2 minutes etc or just have it randomly picked). Add an option to display keyboard buttons or PlayStation buttons because it is usually only displays PlayStation buttons.