Its a combination of Zombie survival and Tycoon game called Zombie Tycoon.

Everything is simple drag and drop.

LD Project: https://ldjam.com/events/ludum-dare/41/zombie-tycoon

Game: http://users.aber.ac.uk/dah56/Zombies/ Repo: https://github.com/DavidWilliamHunter/LDJAM41

This the not my first time attempting Ludum Dare, but it is the first game I've completed and submitted.

I was harder than I thought to get going. I didn't know either javascript or Phaser, but one system is much like another and I muddled through. My code is a hopeless mess, I wouldn't advise attempting to learn from it, unless you want to know how not to do things.