the different coloured birds have different things you cant do if you want them to stay. green means no double jump and yellow means no killing enemies. an excellent and frustrating game
great game but i think the ai could do with some improvements. if your destroyer is attacking the enenmy base and a tank fires on it, the destroyer should wipe out the tank before resuming the destruction of the base. other than a few minor details, this has potential and you should listen to the positive feedback and ignore the idiots who say"oh its crap" and keep working on this game.