i have a few issues with the strategy ideas. first, the idea of 5 defensive perimeters does not make sense as the enemy is coming from space and can therefore strike anywhere at any time. Also, the intelligence idea suggests that at the start of the game we are already capable of breaking some alien transmissions whereas in X-1 we are told such a thing would take humanity longer than our planet's existence to accomplish. also the idea that interceptors are non renewable suggests that all plane factories in the world suddenly dropped what they were doing when the aliens attacked and destroyed their facilities. Also the idea behind the skills of the different aliens makes little sense. We know for fact that a group of Androns can easily take on an armoured division with plasma cannons, yet you say an armoured division can easily counteract them. Also the Harridan's ability suggests that no one will notice a UFO landing, disgorging a group of Harridans or the noise of the jetpack and sniper they use. I can understand them killing one soldier but no them being immune to a response.
