I liked the idea, and it didn't felt like "another tower defender" game. I wish the unsued cards could be kept by the player (as they will get a limited amount of money to keep up with an already limited about of cards in the deck), and it would be cool to polish the UI to fit the theme. Overall, I hope you expand on this concept, because I like the idea of using a deck of cards as your way to play tower defender (also, protecting the dragon is a good idea for a game). Good work