That you have to wait a relatively long time until you have after losing a fight back has full power (about 40 min. In Lv 8) a bit annoying but I just so in between playing the game, I can live with it. For the piece by play-it is - admittedly - not suitable. But it's fun, and it even has a little story if you bother making the text before each fight to read ....
So, for the long wait between the individual struggles one star deduction, otherwise all good.