I don't like the fact that you can't buy dollars and heart life. I have all this built up money and its just sitting there. Its very discouraging. Takes the fun out of building a defense.
Your opponents are cresting the horizon and time is running out! Build cannons, save money, stockpile secret weapons and brace for impact before the enemy closes in!
They only gives you unlucky 13 anchors each level, that's not enough to build a good defense. At least with fort defenders it gives you enough barrels to build up your defense. Sorry I bought it.