More customization:
Basically when creating a new game you have alot more options that change how the game works, heres SOME of them:

Zombie spawn Rate: 0.25x - 3.00x
(Changes how many zombies are in a town)

Town Spawn Rate: 1 - 4
(How many towns can spawn in 10km.)

Enemy HP: 0.50x - 3.00x
(How much max HP an enemy has.)

Enemy SPD: 0.50x - 2.25x
(Speed of enemy WalkSpeed)

Valuable Spawn Rate: 0.25x - 2.00x
(How many valuables spawn per house)

The bridge thing (i forgot the name):
40km - 240km
(When the final bridge thing appears)

(All of these change how many bonds u get when you beat the game and how many bonds spawn in a bank)