Its a fun take on the Tower Defense genre in that you dont build towers but rather units with health bars, that move across the battlefield. You can upgrade the three available units in three stages and there are four maps to do so. Thats the biggest gripe i have about this game: its really short and there arent that many options to build. The maps themselfs are pretty diverse though with doors, multiple paths and attacks from different directions. The difficulty level is pretty high, but there are 3 difficulties to choose from. Overall its a fun game that could be really interesting once its properly fleshed out with more maps, units and propably buildings to choose from.