There is no 'storyline' behind the game so no external goal.
That would be okay, but there is no reset when no moves are on the board. I assume the developers thought this would make the game more challenging, but it just causes frustration because the player is dependent on the power ups to get further when the board is stuck.
Use the power-ups and still stuck requires waiting for-e-ver for them to recharge. Restarting the level does not recharge the power-ups!
There is no randomization to the drops either so that the level has to be replayed ad infinitum to try and use the power-ups correctly to get past being stuck.
I dislike this game very much and I love match-3 games. Gave up at level 72.