I wanted to give a proper review, but basically it comes down to this:
Poorly edited zombies en masse, a huge amount of leaks (bad triggering), poor terrain and very short.
On top of that, it's really easy to finish, there's only one item which can never be bought (costs too much), the objects are clearly very lacking (for one, the damage is incorrect because the dice values were never used and the projectile speed is too slow for the marines), etc.
I could continue, but I believe I made my point: 1/5, rejected.