I didn't saw a game at the same time buggy and heavy to handle for standard rigs in many years, and i thought there wouldn't be more games like that, but i seem to be wrong...
Even at the lowest graphic's details, that makes the game somewhat near of a bunch of pixels if not worse, this game can still suck half of my computer's CPU... and i play far more heavier games, that my PC handle a lot better than this.
For the in game issue, there isn't much to complain about: the reload function is one of the most interesting things i found here, but, finding other weapons (other than the pistol) from the floating space above killed zombies (over the scrap, another interesting thing of this game, which is the resource of building towers and stuff), doesn't sound really right for me... i mean, a zombie that drops a bazooka?
Next, the game is insanely hard even on normal difficult, because of the bugs i'm gonna explain, which need you to be costantly concentrated on it.
If you are on a higher height than the zombies, you can't aim your gun down to shoot them.
The camera is in third person, very badly modeled, since you can't see from upper and lower the incoming zombies, expecially when the camera zooms, and you have very few chance to react on time because of that.
Every level also have the same encounters, so just knowing what's next is enough to win the game, if you got problems on progressing.
And, to end, there isn't a way to heal yourself from taken damage, as i seen.
I had more fun playing Dead Horde instead of this. This MUST have a lot of fixes, because, as the game is now, it's worse than an Early Access.