Zup,
I have two requests/suggestions to make:
1 - Things works well in my Nexus 7 2013. But on my Galaxy S2 (running a cooked version of kitkat), i cant turn my plane. DXP29 said he had the same issue, and told me to clear app's cache. I cleared the cache, nothing. Unninstaled the game, rebooted my S2, reinstalled it, nothing. But if you cant figure it out easily, just let it be, dont waste too much effort if it is only for S2 users, since its a quite old (although very good) phone. This first request isnt of much importance.
2 - My main concern (and the one that really bothers me) is the fact that aiming with the tank is an unfair and annoying exercise of (bad) luck, a blind trial and error, since im totally unable to see the cannon tip. I know, you want to have a "loyal model" of the ww1, but the game's first priority and compromise is to be pkayable and enjoyable. So, I dare to ask for "a little unloyaltie" to the model, making the canon a little bigger - enough to enable us to have a good notion of the angle at which the shell will be thrown.
Suggestion: Instead of changing perverting the 3D model structure, it would be nice if we had the info on the screen telling us how much degrees the cannon is from the ground... Please, let me know if its feasible, and let me know if I made myself clear enough in my poor "engrish".