The graphics are colorful in 3D and makes a good impression, without that performance would suffer. The soldiers look rather cute as evil, but are animated nicely.
The control is simple and intuitive and is learning very fast.
First, you start with simple balls, later there are also other ammunition and spells that can help you.
The app permissions and is hardly calls with kanpp 20MB pretty slim for a 3D game.
A nicely made game in between, you can buy without hesitation for one euro. Quite a buy recommendation.