I have the most recollection of this one, it's better than the first gameplaywise since it has much more to offer (and many more medals...) but storywise it has nothing, i guess the devs never intended to have a second so they ended the story on the first one. I also miss the small diary notes after each mission, they were fun but i guess you can't have everything.
After 5h 13m 31s i can put this to rest aswell, getting all of the hidden spots was an annoying chore that i wish to never do again, the survival mode was a fun addition compared to the first, but io do hate when a zombie crosses the line on a tower defewnse mission and you kill him but it still counts as a zombie that passed into the zone. Well time to finishe the 3rd.