This is just a really fun game. I was disappointed there wasn't another round with more spells and enemies. This is definitely a game that could be made into a full game. Very very fun, great music, great sounds, great art style. Great job on this. Truly.
Edit: The only thing I think that hurt it was that it was very tough to move and click for spells at the same time. I wish there was a button or set of buttons to control buying / arranging spells. Maybe the arrow keys and then you're playing it like a piano, with split mind.