The focus would be on infantry units, fighting against overwhelming number of zombies who have low hp. On the other hand, if one of them got close enough to attack you, it would be pretty much instant kill. Think both sides being fragile would make the campaign more intense since you'd have to rely heavily on reaction times and careful movement. The missions would have multiple objectives, and you would not have time to accomplish them all. This would force you to make quick decisions and prioritize between goals. Could also give the L4D cast a role in the campaign since I've been doing SHPs of some of them

Though would have to create SHPs for the zombies too. And maybe think of a few unique zombie types. Interested to see what kind of stuff the TS logics could be used for zombie type units.