Cool
A pretty good game. The graphics were very nice, I really liked the flapping of the dragons wings and how they stopped when you didn´t moved. I also liked the look of most of the spells. The sounds were also good. I didn´t liked some of the music, but luckily I could switch to another song of I wanted to.
A bad part was that sometimes the whole screen was filled with enemies, arrows and rocks attacking you and you really couldn´t avoid being hit anymore. This costed me all my lives at the beginning. Later I bought the water spells which healed me enough to keep me going until the windy level (level 7 I think it was) and then I died, so the game was very hard. I can´t imagine it´s possible to reach level 13, especially not if the game get´s harder with each level. It would be better if there were less enemies on the screen at the same time. Also the levels were pretty long, I wouldn´t mind if they were shorter and that there are more levels in total. And one last thing: Perhaps you should add "already purchased" in the upgrade screen at stuff you´ve bought already. I know I could check this myself, but it´s just much nicer.
Overall 8 out of 10, 4 out of 5. Well I did enjoyed it, even though it was very hard. I wouldn´t mind seeing more of these, keep up the great work.