The camera zooming out and the enemies getting bigger and bigger gives a great sense of scale! I also liked how just moving the wizard higher and higher makes the approach you have to take to attacking the enemies different (i.e. having to account for the time it takes the fireball to get there. The enemy variety with different attacks was also great, and I loved the intro and epilogue cutscenes!
I would have liked a little more options in terms of how to deal with the enemies; e.g. the lightning strike was great, but didn't work on enemies above a certain height. I also wonder if being able to see the enemies' health would have been helpful -- especially those big bastards.
Anyway, great job on this!