Tips From Evony
I've played Evony Online, which is basically a more advanced version of haypi. I think you should take some things from that, not to the point of plagerising, but to the point of improving. (I think they may have upgraded it from the time I played.) For example transporters- a special type of troop used to carry resources. Or alliance leader, vice, officer, member. There are a lot of things already in the suggestion forums.