Zombie Defense Gamemode

(I hope this is the right area)

Since there's no featured gamemode for the Harrowing this year, I thought I'd bring up an idea for next year. Zombie Defense! It would be played on the Howling Abyss. 5 Players have to defend against a hoard of zombie minions. The minions would spawn in waves and the players have to defend their turrets and nexus. Every few waves, a super powered zombie would spawn (akin to super minions) that would be harder to kill. There could be multiple levels where the minions are more and more difficult. There could also be a chance of a random AI Champion spawning that you have to kill.

I was thinking that if people wanted to buy items they'd only be able to do so in between waves.

Thoughts? Feedback? :3