At first I hoped that it would actually be a good sports game or something like this, well... I was disappointed. And I was even more when I started to play the game. It is rather not about the skills, it's about luck. And many times the game generates a situation in which it is not possible to hit 2 subsequent balls or hit the ball while avoiding a bomb that is coming just after it. The game is also faulty and has some irritating bugs and glitches. Few issues:
1. The game is not saving progress, so you have to do all bombs, cages or walls challenges in one sitting;
2. In some challenges, especially in Keep it up, although you have passed a wave successfully without any strikes the game fails to send you the next wave of balls and all you can do is to quit.
3. The Keep it up challenge has its own unique bug: very often the player to the right fails to show up for the match, so you cannot play.
4. It can also happen that although you finish the challenge the game won't tell you that you won or won't redirect you back to the challenges select screen, pressing the "back" button is not helping at all, it is not working, so all you can do is to reload the game and if you remember point 1 above - if you for example passed 3 walls challenges you have to do it all over again - extremely irritating.
5. I don't know what's wrong with this challenge, but I had to beat the Alien challenge 3 times before finally the game decided that I actually deserve the medal.
So definitely there are some fields in which this game can - and should - be improved.