Zombie type of survival game

Hi guy’s currently Working on a zombie survival type of game in unity3d. The aim is to survive unlimited round’s of zombie’s and each time you survive a round the zombie’s get harder, It’s basicly going to be like Call of Duty Black ops zombies.

Story Line
None.

Pictures and Videos
Before some items added in house:

Some detail added to the building / house.

To Add

  1. More detail outside the house to make it more zombie ish.
  2. Trees out side of the map.
  3. More detail inside the house to make it look zombie ish.
  4. Weapons and scripts.

Why am I making this?
I am making this game to see if me and my mate can fully complete it, If we do manage to stick to making it then after the release of this survival we are going to attempt to make a massive online Zombie survival mmorpg like War-z and Day-z.

Stairs are way too steep… you have to jump to even get up them. How to you plan to have mobs get up them.