It's a good enough little game, think of a blend between an RTS and a tower defence. The goal is to survive x/x waves of undead. There are 8 levels following a pretty basic story giving context to the game, there is also a survival mode. However, the survival mode seemingly only has the 1 map at the moment, so replayability is limited. Expect a difficulty spike in the later levels on hard mode. Lack of an option to 'save' during a game is frustrating, so make sure you have enough time to finish a level before you start.

TL;DR, It's serviceable and entertained me, get it on sale for a few bucks, play a match and if it's not for you, return it.