Hello old acknex people! I started a project back in 2016.. worked on and off. Finally finished. It's on Google Play for android devices. Give it a try!

Follow the link to download:
https://play.google.com/store/apps/details?id=com.lasertraingames.zta

I tried it. The game is really well made and I like it! Although it's pain in the ass to reload when the zombie attack escalates. May I ask which engine you are using?

Construct 3