The game has a nice graphics and a simple operating principle. I played many years ago something similar as (completely free, ad-supported) browser game. Then as now, which is quite nice for a few hours, but for the long-term motivation, the gameplay is too simple - to build simulations like "Civilization" or "The Settlers" does not approach the game.
My criticism, however, is directed against the pay principle. Mir is already clear that a company must also come at your expense (only the television advertising was certainly expensive) but in this game does not surprise me that children drive the smartphone bill to astronomical heights or people go into debt because of virtual purchases ,
At every turn you will be motivated, but please invest "Rubies". The long waiting times for the construction of the building deal - rubies. The defense reinforce an attack to counter - rubies. Enlarge The castle, because otherwise it will be too tight - rubies. Moreover, constantly coming any dealer past and promise the best deals, of course limited in time if you decide to invest just so many rubies.
Rubies can not generate by the game industry (apart from a few rubies obtained for Level Rises and the like), but buy only against Euro. And who thinks, then you invest just a 10 times will be surprised how quickly the 15,000 rubies are gone - the things cost namely always the same x-thousand rubies.
Again, I do not go for nothing to work and if I like a game, I do not mind paying for it. Given the low complexity but I would see here a maximum of 20 EUR as appropriate. This in-game trading rubies seems to me but it created gamblers with little self-control and to entice children to invest immense amounts. If you have been going into the pay cycle no overview at how many euros you come out at the end. But the massive television advertising is that here high conversions are made.
I think that from the ethical point of view to be problematic!