Average
Very nice artistic style, it was beautiful. The game, however, seemed very slow paced and overall really easy. I closed the game after wave 9 because it was getting way too repetitive. Many other TD games would let you have many many more upgrades and many more towers built within the first 5 minutes of the game. It took almost 5 minutes to get 2 upgrades and 3 towers. It's almost like a tower defense game for children.
Great work though, please improve for the next one!