It is difficult because of its performance. It does about 10 FPS (feels the same as Labirynth Lite) but in order to be enjoyable it should have at least 30 FPS. Also the ball is sort of attracted to the holes. Visually it should not fall into hole but the game makes it fall from some distance. That makes it quite frustrating.

I have contacted the developer and hopefully those issues will be fixed. But until then it is not worthy of the price IMO.