Pixelated first person zombie shooter for kindle. What is it called?

A friend had this game that I really want to get it for my son… We love zombie games… It was a very boxy… Almost like minecraft. The only thing I can remember is possibly the word withdraw written in white, and a large Z that looks like blood. In game play looks like arms holding what ever inventory you have equipped… (I know thats what 1st person shooters are like im just spitballing) you get to select your charater- characters are weapon specific. Weapons didn t break but did run out of ammo… That s all I ve got, anyone willing to help I woukd appreciate it so much. Thank you thank you thank you

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