Pros:

- The laser was interesting
- The rock trowing was also interesting

Cons:

- Too linear (we are just zigzagging and running in circle)
- no continuity (Complete change of safe room texture between level was really bad)
- Unbreakable door 
- Elevator doesn't wait for other player 
- Bad nav 
- not enough prop 
- too many panic event
- why so many jimmy gibb (All kind of special zombie) and witch, it like you are trying to fill in
- Inside pine tree?

Conclusion:

Some good idea, but overall I got ass cancer.

I'm giving you 2 star for the effort.