This is simply a donate version of the free game, if you like this game and my other game Star Rampage please consider buying this and support a lonely developer to make more awesome games.Oh and it’s ad free!Defend your city from the malevolent flying DROIDS! The DROIDS are killed by a touch, but BEWARE – some are smart and sneak round the edges. Let a single one in and the DROIDS win – The DROIDS ALWAYS win…A VERY hard game.