He stop developing the game when reached the version 0.8, because of a script problem in AI enemies.
The game is addicted, famous youtubers presented the game, but it did not solve the problem in the last update, and give the download link for the unity project.
every body can download and fix the problem.
You can see the bugged version, here
the enemies don't move.
You can play zumbi blocks 0.7 in kongregate, here:
In may of this year, he released the unity game project, for everybody
You can download the unity project here
I hope for someone help fixing the bug.