I have started to work on this project a while ago, but i kinda lacked some api which made it to impossible to do in the way i wanted (Advanced model handlings), now i brought it back and it's in alpha stage:
http://resike.github.io/PlantsVsGhouls/
It's basically gonna be a tower defense game, just like Blizzard's Peacebloom vs Ghouls one.
I only worked on it like 1-2 days so you can't really do much in it, just create and destroy plants, bu you'll get the idea of the game. Most of the textures and sounds and models just a placeholders, might change them in the future.
"/pvg" - toggles the addon's visibility.