Good!
Before you read this i Want to inform you that I have not played Invasion 2, I have only played 1 and 3.
The graphics could be better so could the sound, how about a battlemusic in the back, that we could turn off if we got tired of it.
I also reccomend that we could start by attacking small villgaes, then bigger towns, then forts and in the end, castles.
I also think you should let for example the cannons have three HP and the cavalry 2 HP, With that i mean that the cannons should not die as fast as the archers.
One thing I dislike is that this game is much easier than number 1.
I ruled number one after half an hour, in this game it took me about tem minutes.