Apoca v. 0.5 file - Apocalypse Now

Game is in its alpha stage. In my game you have 2 which i called smasher cubes to smash incoming waves of zombies in a apocalypse scenario. There is more planned to do of course. But first of all some feedback is more important :) Any comment, critic is welcome. Does the game make fun? if not is there a chance to improve? How? Thanks...