It's weird that at the last part the guy named "dada" can block the zombies without dying, the zombies can pass through him so what i did is I didn't get to the boat yet and I just killed the zombies until my ammo was all gone ;) So don't panic at the end they can't get near you :D
 "The Last Stand: Union City"){kind=icon}
 "Kingdom Rush Frontiers"){kind=icon}