"Mindless fun". Literally.
Pound of Ground is a simple, open-world game, focusing on stemming the tide of a zombie horde in what is presumably the Western Wastes of the USA. The operative word here being "simple". You either shoot zombies, beat them about the skull with a bat, or run them down in your very own hot rod. There are little "metagames" strewn about, such as setting distance records for jumps in your car, or how far you can knock away a zombie with your bat, and these help stave off the monotony that sets in with every zombie-killing game.
The graphics are chunky, and the voice acting is evident of a development team whose first language wasn't English, but the music is pretty cool, and the cartoonish nature of the visuals make up for any cutscenes you'll inevitably want to start skipping.
The lack of polish on this game makes it hard for me to recommend to anyone when it's not on sale, but it's definitely worth at least a run through it's demo.