Pretty good, but would be nice to have endings, when you won the last battle nothing happens...like it was other regular battle.
Tip: you can accumulate coins just waiting for the opponent, not sending any warrior. Max the numbers of archers on your defense and you will be fine for a long time. When your tower's life got red just repair and wait more time. Then prepare a big attack using all your soldiers. I did this and won the Vercing's Stage 10 with 5k coins.