The game is REALLY chalenging, you have to know pokemon weaknesses and have strategic thinking to place the right towers at the right place. Some levels are really difficult (Me and my GF who helped testing have passed all levels, but several moments were very difficult) I don't think there will be more than 15-20 people OVERALL who will be able to pass it.
If you passed the game - share here your thoughts, and suggestions for the next version of the game!