Cool game!
The graphics are simplistic but get the job done. The music is a bop and the mechanics are good, but I would suggest changing the spells at the bottom to buttons instead of clicks (maybe 1, 2, and 3 on the keyboard).
The clarity of the attacks aren't all that present for me. When I use freeze or ignite, the particles show up and let me know that I used it, but sometimes it just makes the sound effect without any particles. Do you need to be near a dragon for it to work?
Another cool game from you, good work!