To be honest, I didn't find the movie as bad as the other reviews, but this is definitely not a horror.
Don't expect frightening scenes or zombies, or very elaborate characters. Those things don't exist here. It's just a few characters trying to survive, in a way that's almost comical.
Honestly, I saw it as a comedy movie, the kind we watch to pass the time, when we don't want to think too much or get agitated... it works. It's almost what you expect when you go to see "Zumbilândia" for the first time. It's good to pass the time.
If you want to watch it, don't wait for a movie like "Train to Busan" or "Alive", because it's not. It's not even intended to make you terrified, let alone the claustrophobic or desperate feeling of regular zombie movies. It got me more laughs than anything, although it scared me once or twice.