Let's go back 106 years in the past and kill zombies while Titanic sinks...

I just played the campaign
1:34 min gameplay and 2,366 zombies were killed.

Good campaign, I like the idea with the Titanic. Perhaps when it could be done, that the survivors be part of the impact and sinking of the Titanic, to make the Titanic sink. That would be unimaginable. I think there are several people who are able to do that, who are good at making maps and visual effects.
Let's go back to this campaign.

+ A lot of places to explore
+ Long levels
+ Good bots navigation
+ Well-balanced number of zombies and hordes attacks
.........................
- A little more detail would be fine
- a little more stock, first aid at least (Since I always play on advanced, even when I'm play campaig for the first time)