This is The best open world, zombie-infested, survival game you will find for single player. The multiplayer is still lacking, but for an alpha, it is playable. The fact that there are regular updates, the devs listen to and respond to feedback, and there are plenty of avenues for communication to the fans (YouTube, Forums, Steam Forums, Website, etc...), makes this game a fan favorite of the early access games list.

The visuals are not terrible, but getting better with each update.
The gameplay is tedious, but each tweak they add to the progression of the game has improved it tremendously.
The sound and music is above average.
The motion is mostly fluid, though it will get better with more optimization in beta.
The gameplay is quite intoxicating for those that enjoy open world games, perhaps not so much for those that don't.

I highly recomend this game for anyone wanting a great title in the following genres.
Zombie, Open-world, Survival, Crafting, Creative.