This is a really nice and fleshed out co-op game, I only played single-player but the fact it can be co-op is cool ʕ•ᴥ•ʔ
I love the zombie sprites, and how they're paper thin but also have front, side and back images on them, it was a really nice detail to add to it as it could have easily been just one visible side so the extra effort really added to it