You could do a lil' touch ups. Also it is too easy. Just mass cavalry level 12 and you win. If you made races, more units, maybe other countries could attack you, a story then it would be great!
I also think that they should make something like this into a BIG online game. Like people attack you and you attack other people. Also there could be a story and all that. Maybe better graphics, some buildings, more men, everybody won''t have exact same guys, ect...