Beautiful game!
The art is very impressive. Also, there are a lot of very nice additions that really create a nice vibe to the overall ambience. Really liked the flying mana orbs that go to the character. I can tell that you spent a lot of time on these.
I also liked the diversity of spells, but I feel that the way I have to drag to use them is a little bit awkward. I would have preferred, for example, an assignable key for each slot.
You really nailed the ambience, and this could very well fit a full game!
Nice job