here's my experience of the game summed up:
>download game
>discover that you have 5 hearts and every time you play a level, you lose one
>they force me to spend my first 5 hearts on dumb tutorial battles
>after that i can buy more with my nintendo eshop credit
>close and delete game
like seriously, this is even worse than candy crush. at least in candy crush you only lose a heart if you lose in a level. did not expect this cash-grabby nonsense from them, severely disappointed.