This has many aspects of the movie 300: the "speartons" when they form the shield wall say "sparta!", they have the ability to smash back the enemy with their shields, and on the pause menu, the helmet has a scratch over the eye. Also, in the intro, their is a spearton killing enemies in slow motion, now what does that remind you of? XD
i think the supplies are the real zombies in the game, because every day they regenerate food, water, junk and whatever. like really guys, get it all the first time!
The Repulsor can be used pretty handily for that purpose. I personally felt like the cannon was super clunky and hard to aim due to its size.