They wouldn't even have to make a full app, they could just do what many players want and make an alternate text-based page:

Welcome USERNAME to server X.

City [city1]

Buildings
----------
Barracks lv4 [upgrade]
Barracks lv5 [upgrade]
Barracks lv4 [upgrade]

Cottage lv 3 [upgrade]
Cottage lv 3 [upgrade]
Cottage lv 3 [upgrade]
Cottage lv 3 [upgrade]

Academy lv 7 [upgrade]
Rally Spot lv3 [upgrade]

Research
======
Metal Casting lv 3 [research]
Lumbering lv 5 [research]
Iron Mining lv 2 [research]
Archery lv 0 [research]

Current Troops
=========
40000 Warriors
10000 Archers
500 Workers

Training
======
Train [text box here] workers [OK]
Train [text box here] warriors [OK]
Train [text box here] archers [OK]

Attacks
=====
Launch attack on [xxx,yyy] with [500] ballista; [0] archers; [300] transporters

Set tax rate: [5%]

Apply comforting [OK]
Set mayor [drop down menu]

etc..