I played this a lot in the closed or maybe open beta before they started charging for it.
I thought it was really well made and fun but as an adult player couldn't really see it holding me in and i find the cost to play a bit too high for what it is unless you're a kid maybe. If it wasn't so expensive i'd keep it as a game to play ever now and again.
In some ways i'm really glad they ended up doing well as they deserve it but also surprised that they got away with charging so much for it.
If you are looking something for your children to play then maybe this might be worth having a go. I don't have any though so can't speak from experience on that front.