This is an awesome game. I love the mechanic of reloading towers + upgrading towers, and water and gold. There are a lot of interesting spells and temples too.
There's a bit of a glitch when your deck size is less than your hand size and you can hold an empty card.
I've beat hard mode massing a few of the tower types. I'd be really interested to see how other people can effectively use all 10 tower types (not all at once).