Since this is likely now abandoned (mainly likely due to either stopping development or due to personal reasons, we're not sure)

Decided to try and add some zombies myself, the good news is: it works, but may prove to be hard to impliment some of the other special zombies (like pole vaulting or gargantuar)

Managed to make 3 custom zombies (with the help of some left over sprites in the addon files)

- Screen Door Zombie (just like this version of newspaper, catapaults don't ignore his protection)
- Football Zombie
- Brickhead Zombie (PvZ 2 exclusive which is just a tankier armored zombie)

https://imgur.com/a/Bt3QTBj