Excellent animated sprites and crisp puzzle-action gameplay controls. Those enemy designs have a lot of character! I like how each spell and enemy type is unique in its own way. The way in which each area has it's own unmentioned "quest" that you need to complete in order to proceed is very clever.
The punishing difficulty discourages exploration, which I see as a big drawback in this type of game. There should be more waypoints and shortcuts to get around as well as ways to easily deal with early enemies after you complete their area. I gave up after losing in the blue forest too many times due to the sheer amount of ground I needed to retread just to get back to where I was. Carefully timing your spells over and over, knowing that you'll lose a third of your health if you make a mistake is just too painful to do more than a few times.
The core gameplay is well implemented and very interesting. I just wish for either a difficulty setting or to see the really brutal parts placed in out of the way bonus areas. Great effort regardless, this couldn't have been easy to make in the limited timeframe of the game jam. Very nice work!