Cool that you where able to work a little story into the game! I think the way you implemented the berserk spell was cool. I played through "Story" difficulty (not sure how that ranks on the Easy, Medium, Hard difficulties). I would maybe add a little differentiation in the style of each part of the level, as I wasn't always sure if I was going the right direction. Still, great game for a short jam!
I saw you used Audacity? Did you make the music? I liked it!