Units are very cool and  i like the animations. One change i would do is lighten the units icon in the barracks/cc. We are under the impression that we lack the ressource to train units / we have trained too much when its just that the icon is very dark. Try getting the same background color as other civs.

I was asking myself, since Naked Fanas are naked would it be possible to make it so the armor upgrades dont affect them (if not already the case) so they would be very good early game but die like paper as the game progresses

OMG i didn't knew that thats amazing !

Yes environnemental snapping is a must, we need to find a way to make sure the wall is impassable. Too many NOMAD games where we discover that there just a tiny little gap that allows all the enemy cav to come right through.

TOTAL WAR ♥ doble wall anti siege tower and bye bye    for you idea you need to set up some things, a wall is max 16 people and garnison tower is 20 , so 4 units will be out for no reason. A total war or strongold system is the best, but a lot of changes ahah , if you have to ungarnison the wall after in the other direction is kinda too much micro for a little efficient, tower wall should work like a stair.   Also increase they cost for balance it or reduce their arrow number